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bb1b61b312088ba9f5f2cb606594b6f33c284402
mariadb/sql/sql_table.cc
Alexander Barkov 7f613ebdb6 MDEV-7284 INDEX: CREATE OR REPLACE
2015-04-03 15:43:55 +04:00

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319 KiB
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/*
Copyright (c) 2000, 2014, Oracle and/or its affiliates.
Copyright (c) 2010, 2014, SkySQL Ab.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* drop and alter of tables */
#include <my_global.h>
#include "sql_priv.h"
#include "unireg.h"
#include "debug_sync.h"
#include "sql_table.h"
#include "sql_parse.h" // test_if_data_home_dir
#include "sql_cache.h" // query_cache_*
#include "sql_base.h" // open_table_uncached, lock_table_names
#include "lock.h" // mysql_unlock_tables
#include "strfunc.h" // find_type2, find_set
#include "sql_view.h" // view_checksum
#include "sql_truncate.h" // regenerate_locked_table
#include "sql_partition.h" // mem_alloc_error,
// generate_partition_syntax,
// partition_info
// NOT_A_PARTITION_ID
#include "sql_db.h" // load_db_opt_by_name
#include "sql_time.h" // make_truncated_value_warning
#include "records.h" // init_read_record, end_read_record
#include "filesort.h" // filesort_free_buffers
#include "sql_select.h" // setup_order,
// make_unireg_sortorder
#include "sql_handler.h" // mysql_ha_rm_tables
#include "discover.h" // readfrm
#include "my_pthread.h" // pthread_mutex_t
#include "log_event.h" // Query_log_event
#include "sql_statistics.h"
#include <hash.h>
#include <myisam.h>
#include <my_dir.h>
#include "create_options.h"
#include "sp_head.h"
#include "sp.h"
#include "sql_trigger.h"
#include "sql_parse.h"
#include "sql_show.h"
#include "transaction.h"
#include "sql_audit.h"
#ifdef __WIN__
#include <io.h>
#endif
const char *primary_key_name="PRIMARY";
static bool check_if_keyname_exists(const char *name,KEY *start, KEY *end);
static char *make_unique_key_name(const char *field_name,KEY *start,KEY *end);
static int copy_data_between_tables(THD *thd, TABLE *from,TABLE *to,
List<Create_field> &create, bool ignore,
uint order_num, ORDER *order,
ha_rows *copied,ha_rows *deleted,
Alter_info::enum_enable_or_disable keys_onoff,
Alter_table_ctx *alter_ctx);
static bool prepare_blob_field(THD *thd, Create_field *sql_field);
static bool check_engine(THD *, const char *, const char *, HA_CREATE_INFO *);
static int mysql_prepare_create_table(THD *, HA_CREATE_INFO *, Alter_info *,
uint *, handler *, KEY **, uint *, int);
static uint blob_length_by_type(enum_field_types type);
/**
@brief Helper function for explain_filename
@param thd Thread handle
@param to_p Explained name in system_charset_info
@param end_p End of the to_p buffer
@param name Name to be converted
@param name_len Length of the name, in bytes
*/
static char* add_identifier(THD* thd, char *to_p, const char * end_p,
const char* name, uint name_len)
{
uint res;
uint errors;
const char *conv_name;
char tmp_name[FN_REFLEN];
char conv_string[FN_REFLEN];
int quote;
DBUG_ENTER("add_identifier");
if (!name[name_len])
conv_name= name;
else
{
strnmov(tmp_name, name, name_len);
tmp_name[name_len]= 0;
conv_name= tmp_name;
}
res= strconvert(&my_charset_filename, conv_name, name_len,
system_charset_info,
conv_string, FN_REFLEN, &errors);
if (!res || errors)
{
DBUG_PRINT("error", ("strconvert of '%s' failed with %u (errors: %u)", conv_name, res, errors));
conv_name= name;
}
else
{
DBUG_PRINT("info", ("conv '%s' -> '%s'", conv_name, conv_string));
conv_name= conv_string;
}
quote = thd ? get_quote_char_for_identifier(thd, conv_name, res - 1) : '"';
if (quote != EOF && (end_p - to_p > 2))
{
*(to_p++)= (char) quote;
while (*conv_name && (end_p - to_p - 1) > 0)
{
uint length= my_mbcharlen(system_charset_info, *conv_name);
if (!length)
length= 1;
if (length == 1 && *conv_name == (char) quote)
{
if ((end_p - to_p) < 3)
break;
*(to_p++)= (char) quote;
*(to_p++)= *(conv_name++);
}
else if (((long) length) < (end_p - to_p))
{
to_p= strnmov(to_p, conv_name, length);
conv_name+= length;
}
else
break; /* string already filled */
}
if (end_p > to_p) {
*(to_p++)= (char) quote;
if (end_p > to_p)
*to_p= 0; /* terminate by NUL, but do not include it in the count */
}
}
else
to_p= strnmov(to_p, conv_name, end_p - to_p);
DBUG_RETURN(to_p);
}
/**
@brief Explain a path name by split it to database, table etc.
@details Break down the path name to its logic parts
(database, table, partition, subpartition).
filename_to_tablename cannot be used on partitions, due to the #P# part.
There can be up to 6 '#', #P# for partition, #SP# for subpartition
and #TMP# or #REN# for temporary or renamed partitions.
This should be used when something should be presented to a user in a
diagnostic, error etc. when it would be useful to know what a particular
file [and directory] means. Such as SHOW ENGINE STATUS, error messages etc.
Examples:
t1#P#p1 table t1 partition p1
t1#P#p1#SP#sp1 table t1 partition p1 subpartition sp1
t1#P#p1#SP#sp1#TMP# table t1 partition p1 subpartition sp1 temporary
t1#P#p1#SP#sp1#REN# table t1 partition p1 subpartition sp1 renamed
@param thd Thread handle
@param from Path name in my_charset_filename
Null terminated in my_charset_filename, normalized
to use '/' as directory separation character.
@param to Explained name in system_charset_info
@param to_length Size of to buffer
@param explain_mode Requested output format.
EXPLAIN_ALL_VERBOSE ->
[Database `db`, ]Table `tbl`[,[ Temporary| Renamed]
Partition `p` [, Subpartition `sp`]]
EXPLAIN_PARTITIONS_VERBOSE -> `db`.`tbl`
[[ Temporary| Renamed] Partition `p`
[, Subpartition `sp`]]
EXPLAIN_PARTITIONS_AS_COMMENT -> `db`.`tbl` |*
[,[ Temporary| Renamed] Partition `p`
[, Subpartition `sp`]] *|
(| is really a /, and it is all in one line)
@retval Length of returned string
*/
uint explain_filename(THD* thd,
const char *from,
char *to,
uint to_length,
enum_explain_filename_mode explain_mode)
{
char *to_p= to;
char *end_p= to_p + to_length;
const char *db_name= NULL;
int db_name_len= 0;
const char *table_name;
int table_name_len= 0;
const char *part_name= NULL;
int part_name_len= 0;
const char *subpart_name= NULL;
int subpart_name_len= 0;
uint part_type= NORMAL_PART_NAME;
const char *tmp_p;
DBUG_ENTER("explain_filename");
DBUG_PRINT("enter", ("from '%s'", from));
tmp_p= from;
table_name= from;
/*
If '/' then take last directory part as database.
'/' is the directory separator, not FN_LIB_CHAR
*/
while ((tmp_p= strchr(tmp_p, '/')))
{
db_name= table_name;
/* calculate the length */
db_name_len= tmp_p - db_name;
tmp_p++;
table_name= tmp_p;
}
tmp_p= table_name;
/* Look if there are partition tokens in the table name. */
while ((tmp_p= strchr(tmp_p, '#')))
{
tmp_p++;
switch (tmp_p[0]) {
case 'P':
case 'p':
if (tmp_p[1] == '#')
{
part_name= tmp_p + 2;
tmp_p+= 2;
}
break;
case 'S':
case 's':
if ((tmp_p[1] == 'P' || tmp_p[1] == 'p') && tmp_p[2] == '#')
{
part_name_len= tmp_p - part_name - 1;
subpart_name= tmp_p + 3;
tmp_p+= 3;
}
break;
case 'T':
case 't':
if ((tmp_p[1] == 'M' || tmp_p[1] == 'm') &&
(tmp_p[2] == 'P' || tmp_p[2] == 'p') &&
tmp_p[3] == '#' && !tmp_p[4])
{
part_type= TEMP_PART_NAME;
tmp_p+= 4;
}
break;
case 'R':
case 'r':
if ((tmp_p[1] == 'E' || tmp_p[1] == 'e') &&
(tmp_p[2] == 'N' || tmp_p[2] == 'n') &&
tmp_p[3] == '#' && !tmp_p[4])
{
part_type= RENAMED_PART_NAME;
tmp_p+= 4;
}
break;
default:
/* Not partition name part. */
;
}
}
if (part_name)
{
table_name_len= part_name - table_name - 3;
if (subpart_name)
subpart_name_len= strlen(subpart_name);
else
part_name_len= strlen(part_name);
if (part_type != NORMAL_PART_NAME)
{
if (subpart_name)
subpart_name_len-= 5;
else
part_name_len-= 5;
}
}
else
table_name_len= strlen(table_name);
if (db_name)
{
if (explain_mode == EXPLAIN_ALL_VERBOSE)
{
to_p= strnmov(to_p, ER_THD_OR_DEFAULT(thd, ER_DATABASE_NAME),
end_p - to_p);
*(to_p++)= ' ';
to_p= add_identifier(thd, to_p, end_p, db_name, db_name_len);
to_p= strnmov(to_p, ", ", end_p - to_p);
}
else
{
to_p= add_identifier(thd, to_p, end_p, db_name, db_name_len);
to_p= strnmov(to_p, ".", end_p - to_p);
}
}
if (explain_mode == EXPLAIN_ALL_VERBOSE)
{
to_p= strnmov(to_p, ER_THD_OR_DEFAULT(thd, ER_TABLE_NAME), end_p - to_p);
*(to_p++)= ' ';
to_p= add_identifier(thd, to_p, end_p, table_name, table_name_len);
}
else
to_p= add_identifier(thd, to_p, end_p, table_name, table_name_len);
if (part_name)
{
if (explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT)
to_p= strnmov(to_p, " /* ", end_p - to_p);
else if (explain_mode == EXPLAIN_PARTITIONS_VERBOSE)
to_p= strnmov(to_p, " ", end_p - to_p);
else
to_p= strnmov(to_p, ", ", end_p - to_p);
if (part_type != NORMAL_PART_NAME)
{
if (part_type == TEMP_PART_NAME)
to_p= strnmov(to_p, ER_THD_OR_DEFAULT(thd, ER_TEMPORARY_NAME),
end_p - to_p);
else
to_p= strnmov(to_p, ER_THD_OR_DEFAULT(thd, ER_RENAMED_NAME),
end_p - to_p);
to_p= strnmov(to_p, " ", end_p - to_p);
}
to_p= strnmov(to_p, ER_THD_OR_DEFAULT(thd, ER_PARTITION_NAME),
end_p - to_p);
*(to_p++)= ' ';
to_p= add_identifier(thd, to_p, end_p, part_name, part_name_len);
if (subpart_name)
{
to_p= strnmov(to_p, ", ", end_p - to_p);
to_p= strnmov(to_p, ER_THD_OR_DEFAULT(thd, ER_SUBPARTITION_NAME),
end_p - to_p);
*(to_p++)= ' ';
to_p= add_identifier(thd, to_p, end_p, subpart_name, subpart_name_len);
}
if (explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT)
to_p= strnmov(to_p, " */", end_p - to_p);
}
DBUG_PRINT("exit", ("to '%s'", to));
DBUG_RETURN(to_p - to);
}
/*
Translate a file name to a table name (WL #1324).
SYNOPSIS
filename_to_tablename()
from The file name in my_charset_filename.
to OUT The table name in system_charset_info.
to_length The size of the table name buffer.
RETURN
Table name length.
*/
uint filename_to_tablename(const char *from, char *to, uint to_length,
bool stay_quiet)
{
uint errors;
size_t res;
DBUG_ENTER("filename_to_tablename");
DBUG_PRINT("enter", ("from '%s'", from));
res= strconvert(&my_charset_filename, from, FN_REFLEN,
system_charset_info, to, to_length, &errors);
if (errors) // Old 5.0 name
{
res= (strxnmov(to, to_length, MYSQL50_TABLE_NAME_PREFIX, from, NullS) -
to);
if (!stay_quiet)
sql_print_error("Invalid (old?) table or database name '%s'", from);
}
DBUG_PRINT("exit", ("to '%s'", to));
DBUG_RETURN(res);
}
/**
Check if given string begins with "#mysql50#" prefix
@param name string to check cut
@retval
FALSE no prefix found
@retval
TRUE prefix found
*/
bool check_mysql50_prefix(const char *name)
{
return (name[0] == '#' &&
!strncmp(name, MYSQL50_TABLE_NAME_PREFIX,
MYSQL50_TABLE_NAME_PREFIX_LENGTH));
}
/**
Check if given string begins with "#mysql50#" prefix, cut it if so.
@param from string to check and cut
@param to[out] buffer for result string
@param to_length its size
@retval
0 no prefix found
@retval
non-0 result string length
*/
uint check_n_cut_mysql50_prefix(const char *from, char *to, uint to_length)
{
if (check_mysql50_prefix(from))
return (uint) (strmake(to, from + MYSQL50_TABLE_NAME_PREFIX_LENGTH,
to_length - 1) - to);
return 0;
}
/*
Translate a table name to a file name (WL #1324).
SYNOPSIS
tablename_to_filename()
from The table name in system_charset_info.
to OUT The file name in my_charset_filename.
to_length The size of the file name buffer.
RETURN
File name length.
*/
uint tablename_to_filename(const char *from, char *to, uint to_length)
{
uint errors, length;
DBUG_ENTER("tablename_to_filename");
DBUG_PRINT("enter", ("from '%s'", from));
if ((length= check_n_cut_mysql50_prefix(from, to, to_length)))
{
/*
Check if the name supplied is a valid mysql 5.0 name and
make the name a zero length string if it's not.
Note that just returning zero length is not enough :
a lot of places don't check the return value and expect
a zero terminated string.
*/
if (check_table_name(to, length, TRUE))
{
to[0]= 0;
length= 0;
}
DBUG_RETURN(length);
}
length= strconvert(system_charset_info, from, FN_REFLEN,
&my_charset_filename, to, to_length, &errors);
if (check_if_legal_tablename(to) &&
length + 4 < to_length)
{
memcpy(to + length, "@@@", 4);
length+= 3;
}
DBUG_PRINT("exit", ("to '%s'", to));
DBUG_RETURN(length);
}
/*
Creates path to a file: mysql_data_dir/db/table.ext
SYNOPSIS
build_table_filename()
buff Where to write result in my_charset_filename.
This may be the same as table_name.
bufflen buff size
db Database name in system_charset_info.
table_name Table name in system_charset_info.
ext File extension.
flags FN_FROM_IS_TMP or FN_TO_IS_TMP or FN_IS_TMP
table_name is temporary, do not change.
NOTES
Uses database and table name, and extension to create
a file name in mysql_data_dir. Database and table
names are converted from system_charset_info into "fscs".
Unless flags indicate a temporary table name.
'db' is always converted.
'ext' is not converted.
The conversion suppression is required for ALTER TABLE. This
statement creates intermediate tables. These are regular
(non-temporary) tables with a temporary name. Their path names must
be derivable from the table name. So we cannot use
build_tmptable_filename() for them.
RETURN
path length
*/
uint build_table_filename(char *buff, size_t bufflen, const char *db,
const char *table_name, const char *ext, uint flags)
{
char dbbuff[FN_REFLEN];
char tbbuff[FN_REFLEN];
DBUG_ENTER("build_table_filename");
DBUG_PRINT("enter", ("db: '%s' table_name: '%s' ext: '%s' flags: %x",
db, table_name, ext, flags));
if (flags & FN_IS_TMP) // FN_FROM_IS_TMP | FN_TO_IS_TMP
strmake(tbbuff, table_name, sizeof(tbbuff)-1);
else
(void) tablename_to_filename(table_name, tbbuff, sizeof(tbbuff));
(void) tablename_to_filename(db, dbbuff, sizeof(dbbuff));
char *end = buff + bufflen;
/* Don't add FN_ROOTDIR if mysql_data_home already includes it */
char *pos = strnmov(buff, mysql_data_home, bufflen);
size_t rootdir_len= strlen(FN_ROOTDIR);
if (pos - rootdir_len >= buff &&
memcmp(pos - rootdir_len, FN_ROOTDIR, rootdir_len) != 0)
pos= strnmov(pos, FN_ROOTDIR, end - pos);
pos= strxnmov(pos, end - pos, dbbuff, FN_ROOTDIR, NullS);
#ifdef USE_SYMDIR
if (!(flags & SKIP_SYMDIR_ACCESS))
{
unpack_dirname(buff, buff);
pos= strend(buff);
}
#endif
pos= strxnmov(pos, end - pos, tbbuff, ext, NullS);
DBUG_PRINT("exit", ("buff: '%s'", buff));
DBUG_RETURN(pos - buff);
}
/**
Create path to a temporary table mysql_tmpdir/#sql1234_12_1
(i.e. to its .FRM file but without an extension).
@param thd The thread handle.
@param buff Where to write result in my_charset_filename.
@param bufflen buff size
@note
Uses current_pid, thread_id, and tmp_table counter to create
a file name in mysql_tmpdir.
@return Path length.
*/
uint build_tmptable_filename(THD* thd, char *buff, size_t bufflen)
{
DBUG_ENTER("build_tmptable_filename");
char *p= strnmov(buff, mysql_tmpdir, bufflen);
my_snprintf(p, bufflen - (p - buff), "/%s%lx_%lx_%x",
tmp_file_prefix, current_pid,
thd->thread_id, thd->tmp_table++);
if (lower_case_table_names)
{
/* Convert all except tmpdir to lower case */
my_casedn_str(files_charset_info, p);
}
size_t length= unpack_filename(buff, buff);
DBUG_PRINT("exit", ("buff: '%s'", buff));
DBUG_RETURN(length);
}
/*
--------------------------------------------------------------------------
MODULE: DDL log
-----------------
This module is used to ensure that we can recover from crashes that occur
in the middle of a meta-data operation in MySQL. E.g. DROP TABLE t1, t2;
We need to ensure that both t1 and t2 are dropped and not only t1 and
also that each table drop is entirely done and not "half-baked".
To support this we create log entries for each meta-data statement in the
ddl log while we are executing. These entries are dropped when the
operation is completed.
At recovery those entries that were not completed will be executed.
There is only one ddl log in the system and it is protected by a mutex
and there is a global struct that contains information about its current
state.
History:
First version written in 2006 by Mikael Ronstrom
--------------------------------------------------------------------------
*/
struct st_global_ddl_log
{
/*
We need to adjust buffer size to be able to handle downgrades/upgrades
where IO_SIZE has changed. We'll set the buffer size such that we can
handle that the buffer size was upto 4 times bigger in the version
that wrote the DDL log.
*/
char file_entry_buf[4*IO_SIZE];
char file_name_str[FN_REFLEN];
char *file_name;
DDL_LOG_MEMORY_ENTRY *first_free;
DDL_LOG_MEMORY_ENTRY *first_used;
uint num_entries;
File file_id;
uint name_len;
uint io_size;
bool inited;
bool do_release;
bool recovery_phase;
st_global_ddl_log() : inited(false), do_release(false) {}
};
st_global_ddl_log global_ddl_log;
mysql_mutex_t LOCK_gdl;
#define DDL_LOG_ENTRY_TYPE_POS 0
#define DDL_LOG_ACTION_TYPE_POS 1
#define DDL_LOG_PHASE_POS 2
#define DDL_LOG_NEXT_ENTRY_POS 4
#define DDL_LOG_NAME_POS 8
#define DDL_LOG_NUM_ENTRY_POS 0
#define DDL_LOG_NAME_LEN_POS 4
#define DDL_LOG_IO_SIZE_POS 8
/**
Read one entry from ddl log file.
@param entry_no Entry number to read
@return Operation status
@retval true Error
@retval false Success
*/
static bool read_ddl_log_file_entry(uint entry_no)
{
bool error= FALSE;
File file_id= global_ddl_log.file_id;
uchar *file_entry_buf= (uchar*)global_ddl_log.file_entry_buf;
uint io_size= global_ddl_log.io_size;
DBUG_ENTER("read_ddl_log_file_entry");
mysql_mutex_assert_owner(&LOCK_gdl);
if (mysql_file_pread(file_id, file_entry_buf, io_size, io_size * entry_no,
MYF(MY_WME)) != io_size)
error= TRUE;
DBUG_RETURN(error);
}
/**
Write one entry to ddl log file.
@param entry_no Entry number to write
@return Operation status
@retval true Error
@retval false Success
*/
static bool write_ddl_log_file_entry(uint entry_no)
{
bool error= FALSE;
File file_id= global_ddl_log.file_id;
uchar *file_entry_buf= (uchar*)global_ddl_log.file_entry_buf;
DBUG_ENTER("write_ddl_log_file_entry");
mysql_mutex_assert_owner(&LOCK_gdl);
if (mysql_file_pwrite(file_id, file_entry_buf,
IO_SIZE, IO_SIZE * entry_no, MYF(MY_WME)) != IO_SIZE)
error= TRUE;
DBUG_RETURN(error);
}
/**
Sync the ddl log file.
@return Operation status
@retval FALSE Success
@retval TRUE Error
*/
static bool sync_ddl_log_file()
{
DBUG_ENTER("sync_ddl_log_file");
DBUG_RETURN(mysql_file_sync(global_ddl_log.file_id, MYF(MY_WME)));
}
/**
Write ddl log header.
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool write_ddl_log_header()
{
uint16 const_var;
DBUG_ENTER("write_ddl_log_header");
int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NUM_ENTRY_POS],
global_ddl_log.num_entries);
const_var= FN_REFLEN;
int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_LEN_POS],
(ulong) const_var);
const_var= IO_SIZE;
int4store(&global_ddl_log.file_entry_buf[DDL_LOG_IO_SIZE_POS],
(ulong) const_var);
if (write_ddl_log_file_entry(0UL))
{
sql_print_error("Error writing ddl log header");
DBUG_RETURN(TRUE);
}
DBUG_RETURN(sync_ddl_log_file());
}
/**
Create ddl log file name.
@param file_name Filename setup
*/
static inline void create_ddl_log_file_name(char *file_name)
{
strxmov(file_name, mysql_data_home, "/", "ddl_log.log", NullS);
}
/**
Read header of ddl log file.
When we read the ddl log header we get information about maximum sizes
of names in the ddl log and we also get information about the number
of entries in the ddl log.
@return Last entry in ddl log (0 if no entries)
*/
static uint read_ddl_log_header()
{
uchar *file_entry_buf= (uchar*)global_ddl_log.file_entry_buf;
char file_name[FN_REFLEN];
uint entry_no;
bool successful_open= FALSE;
DBUG_ENTER("read_ddl_log_header");
mysql_mutex_init(key_LOCK_gdl, &LOCK_gdl, MY_MUTEX_INIT_SLOW);
mysql_mutex_lock(&LOCK_gdl);
create_ddl_log_file_name(file_name);
if ((global_ddl_log.file_id= mysql_file_open(key_file_global_ddl_log,
file_name,
O_RDWR | O_BINARY, MYF(0))) >= 0)
{
if (read_ddl_log_file_entry(0UL))
{
/* Write message into error log */
sql_print_error("Failed to read ddl log file in recovery");
}
else
successful_open= TRUE;
}
if (successful_open)
{
entry_no= uint4korr(&file_entry_buf[DDL_LOG_NUM_ENTRY_POS]);
global_ddl_log.name_len= uint4korr(&file_entry_buf[DDL_LOG_NAME_LEN_POS]);
global_ddl_log.io_size= uint4korr(&file_entry_buf[DDL_LOG_IO_SIZE_POS]);
DBUG_ASSERT(global_ddl_log.io_size <=
sizeof(global_ddl_log.file_entry_buf));
}
else
{
entry_no= 0;
}
global_ddl_log.first_free= NULL;
global_ddl_log.first_used= NULL;
global_ddl_log.num_entries= 0;
global_ddl_log.do_release= true;
mysql_mutex_unlock(&LOCK_gdl);
DBUG_RETURN(entry_no);
}
/**
Convert from ddl_log_entry struct to file_entry_buf binary blob.
@param ddl_log_entry filled in ddl_log_entry struct.
*/
static void set_global_from_ddl_log_entry(const DDL_LOG_ENTRY *ddl_log_entry)
{
mysql_mutex_assert_owner(&LOCK_gdl);
global_ddl_log.file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]=
(char)DDL_LOG_ENTRY_CODE;
global_ddl_log.file_entry_buf[DDL_LOG_ACTION_TYPE_POS]=
(char)ddl_log_entry->action_type;
global_ddl_log.file_entry_buf[DDL_LOG_PHASE_POS]= 0;
int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NEXT_ENTRY_POS],
ddl_log_entry->next_entry);
DBUG_ASSERT(strlen(ddl_log_entry->name) < FN_REFLEN);
strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS],
ddl_log_entry->name, FN_REFLEN - 1);
if (ddl_log_entry->action_type == DDL_LOG_RENAME_ACTION ||
ddl_log_entry->action_type == DDL_LOG_REPLACE_ACTION ||
ddl_log_entry->action_type == DDL_LOG_EXCHANGE_ACTION)
{
DBUG_ASSERT(strlen(ddl_log_entry->from_name) < FN_REFLEN);
strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + FN_REFLEN],
ddl_log_entry->from_name, FN_REFLEN - 1);
}
else
global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + FN_REFLEN]= 0;
DBUG_ASSERT(strlen(ddl_log_entry->handler_name) < FN_REFLEN);
strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + (2*FN_REFLEN)],
ddl_log_entry->handler_name, FN_REFLEN - 1);
if (ddl_log_entry->action_type == DDL_LOG_EXCHANGE_ACTION)
{
DBUG_ASSERT(strlen(ddl_log_entry->tmp_name) < FN_REFLEN);
strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + (3*FN_REFLEN)],
ddl_log_entry->tmp_name, FN_REFLEN - 1);
}
else
global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + (3*FN_REFLEN)]= 0;
}
/**
Convert from file_entry_buf binary blob to ddl_log_entry struct.
@param[out] ddl_log_entry struct to fill in.
@note Strings (names) are pointing to the global_ddl_log structure,
so LOCK_gdl needs to be hold until they are read or copied.
*/
static void set_ddl_log_entry_from_global(DDL_LOG_ENTRY *ddl_log_entry,
const uint read_entry)
{
char *file_entry_buf= (char*) global_ddl_log.file_entry_buf;
uint inx;
uchar single_char;
mysql_mutex_assert_owner(&LOCK_gdl);
ddl_log_entry->entry_pos= read_entry;
single_char= file_entry_buf[DDL_LOG_ENTRY_TYPE_POS];
ddl_log_entry->entry_type= (enum ddl_log_entry_code)single_char;
single_char= file_entry_buf[DDL_LOG_ACTION_TYPE_POS];
ddl_log_entry->action_type= (enum ddl_log_action_code)single_char;
ddl_log_entry->phase= file_entry_buf[DDL_LOG_PHASE_POS];
ddl_log_entry->next_entry= uint4korr(&file_entry_buf[DDL_LOG_NEXT_ENTRY_POS]);
ddl_log_entry->name= &file_entry_buf[DDL_LOG_NAME_POS];
inx= DDL_LOG_NAME_POS + global_ddl_log.name_len;
ddl_log_entry->from_name= &file_entry_buf[inx];
inx+= global_ddl_log.name_len;
ddl_log_entry->handler_name= &file_entry_buf[inx];
if (ddl_log_entry->action_type == DDL_LOG_EXCHANGE_ACTION)
{
inx+= global_ddl_log.name_len;
ddl_log_entry->tmp_name= &file_entry_buf[inx];
}
else
ddl_log_entry->tmp_name= NULL;
}
/**
Read a ddl log entry.
Read a specified entry in the ddl log.
@param read_entry Number of entry to read
@param[out] entry_info Information from entry
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool read_ddl_log_entry(uint read_entry, DDL_LOG_ENTRY *ddl_log_entry)
{
DBUG_ENTER("read_ddl_log_entry");
if (read_ddl_log_file_entry(read_entry))
{
DBUG_RETURN(TRUE);
}
set_ddl_log_entry_from_global(ddl_log_entry, read_entry);
DBUG_RETURN(FALSE);
}
/**
Initialise ddl log.
Write the header of the ddl log file and length of names. Also set
number of entries to zero.
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool init_ddl_log()
{
char file_name[FN_REFLEN];
DBUG_ENTER("init_ddl_log");
if (global_ddl_log.inited)
goto end;
global_ddl_log.io_size= IO_SIZE;
global_ddl_log.name_len= FN_REFLEN;
create_ddl_log_file_name(file_name);
if ((global_ddl_log.file_id= mysql_file_create(key_file_global_ddl_log,
file_name, CREATE_MODE,
O_RDWR | O_TRUNC | O_BINARY,
MYF(MY_WME))) < 0)
{
/* Couldn't create ddl log file, this is serious error */
sql_print_error("Failed to open ddl log file");
DBUG_RETURN(TRUE);
}
global_ddl_log.inited= TRUE;
if (write_ddl_log_header())
{
(void) mysql_file_close(global_ddl_log.file_id, MYF(MY_WME));
global_ddl_log.inited= FALSE;
DBUG_RETURN(TRUE);
}
end:
DBUG_RETURN(FALSE);
}
/**
Sync ddl log file.
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool sync_ddl_log_no_lock()
{
DBUG_ENTER("sync_ddl_log_no_lock");
mysql_mutex_assert_owner(&LOCK_gdl);
if ((!global_ddl_log.recovery_phase) &&
init_ddl_log())
{
DBUG_RETURN(TRUE);
}
DBUG_RETURN(sync_ddl_log_file());
}
/**
@brief Deactivate an individual entry.
@details For complex rename operations we need to deactivate individual
entries.
During replace operations where we start with an existing table called
t1 and a replacement table called t1#temp or something else and where
we want to delete t1 and rename t1#temp to t1 this is not possible to
do in a safe manner unless the ddl log is informed of the phases in
the change.
Delete actions are 1-phase actions that can be ignored immediately after
being executed.
Rename actions from x to y is also a 1-phase action since there is no
interaction with any other handlers named x and y.
Replace action where drop y and x -> y happens needs to be a two-phase
action. Thus the first phase will drop y and the second phase will
rename x -> y.
@param entry_no Entry position of record to change
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool deactivate_ddl_log_entry_no_lock(uint entry_no)
{
uchar *file_entry_buf= (uchar*)global_ddl_log.file_entry_buf;
DBUG_ENTER("deactivate_ddl_log_entry_no_lock");
mysql_mutex_assert_owner(&LOCK_gdl);
if (!read_ddl_log_file_entry(entry_no))
{
if (file_entry_buf[DDL_LOG_ENTRY_TYPE_POS] == DDL_LOG_ENTRY_CODE)
{
/*
Log entry, if complete mark it done (IGNORE).
Otherwise increase the phase by one.
*/
if (file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_DELETE_ACTION ||
file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_RENAME_ACTION ||
(file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_REPLACE_ACTION &&
file_entry_buf[DDL_LOG_PHASE_POS] == 1) ||
(file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_EXCHANGE_ACTION &&
file_entry_buf[DDL_LOG_PHASE_POS] >= EXCH_PHASE_TEMP_TO_FROM))
file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]= DDL_IGNORE_LOG_ENTRY_CODE;
else if (file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_REPLACE_ACTION)
{
DBUG_ASSERT(file_entry_buf[DDL_LOG_PHASE_POS] == 0);
file_entry_buf[DDL_LOG_PHASE_POS]= 1;
}
else if (file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_EXCHANGE_ACTION)
{
DBUG_ASSERT(file_entry_buf[DDL_LOG_PHASE_POS] <=
EXCH_PHASE_FROM_TO_NAME);
file_entry_buf[DDL_LOG_PHASE_POS]++;
}
else
{
DBUG_ASSERT(0);
}
if (write_ddl_log_file_entry(entry_no))
{
sql_print_error("Error in deactivating log entry. Position = %u",
entry_no);
DBUG_RETURN(TRUE);
}
}
}
else
{
sql_print_error("Failed in reading entry before deactivating it");
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
/**
Execute one action in a ddl log entry
@param ddl_log_entry Information in action entry to execute
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static int execute_ddl_log_action(THD *thd, DDL_LOG_ENTRY *ddl_log_entry)
{
bool frm_action= FALSE;
LEX_STRING handler_name;
handler *file= NULL;
MEM_ROOT mem_root;
int error= TRUE;
char to_path[FN_REFLEN];
char from_path[FN_REFLEN];
#ifdef WITH_PARTITION_STORAGE_ENGINE
char *par_ext= (char*)".par";
#endif
handlerton *hton;
DBUG_ENTER("execute_ddl_log_action");
mysql_mutex_assert_owner(&LOCK_gdl);
if (ddl_log_entry->entry_type == DDL_IGNORE_LOG_ENTRY_CODE)
{
DBUG_RETURN(FALSE);
}
DBUG_PRINT("ddl_log",
("execute type %c next %u name '%s' from_name '%s' handler '%s'"
" tmp_name '%s'",
ddl_log_entry->action_type,
ddl_log_entry->next_entry,
ddl_log_entry->name,
ddl_log_entry->from_name,
ddl_log_entry->handler_name,
ddl_log_entry->tmp_name));
handler_name.str= (char*)ddl_log_entry->handler_name;
handler_name.length= strlen(ddl_log_entry->handler_name);
init_sql_alloc(&mem_root, TABLE_ALLOC_BLOCK_SIZE, 0, MYF(MY_THREAD_SPECIFIC));
if (!strcmp(ddl_log_entry->handler_name, reg_ext))
frm_action= TRUE;
else
{
plugin_ref plugin= ha_resolve_by_name(thd, &handler_name, false);
if (!plugin)
{
my_error(ER_UNKNOWN_STORAGE_ENGINE, MYF(0), ddl_log_entry->handler_name);
goto error;
}
hton= plugin_data(plugin, handlerton*);
file= get_new_handler((TABLE_SHARE*)0, &mem_root, hton);
if (!file)
{
mem_alloc_error(sizeof(handler));
goto error;
}
}
switch (ddl_log_entry->action_type)
{
case DDL_LOG_REPLACE_ACTION:
case DDL_LOG_DELETE_ACTION:
{
if (ddl_log_entry->phase == 0)
{
if (frm_action)
{
strxmov(to_path, ddl_log_entry->name, reg_ext, NullS);
if ((error= mysql_file_delete(key_file_frm, to_path, MYF(MY_WME))))
{
if (my_errno != ENOENT)
break;
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
strxmov(to_path, ddl_log_entry->name, par_ext, NullS);
(void) mysql_file_delete(key_file_partition, to_path, MYF(MY_WME));
#endif
}
else
{
if ((error= file->ha_delete_table(ddl_log_entry->name)))
{
if (error != ENOENT && error != HA_ERR_NO_SUCH_TABLE)
break;
}
}
if ((deactivate_ddl_log_entry_no_lock(ddl_log_entry->entry_pos)))
break;
(void) sync_ddl_log_no_lock();
error= FALSE;
if (ddl_log_entry->action_type == DDL_LOG_DELETE_ACTION)
break;
}
DBUG_ASSERT(ddl_log_entry->action_type == DDL_LOG_REPLACE_ACTION);
/*
Fall through and perform the rename action of the replace
action. We have already indicated the success of the delete
action in the log entry by stepping up the phase.
*/
}
case DDL_LOG_RENAME_ACTION:
{
error= TRUE;
if (frm_action)
{
strxmov(to_path, ddl_log_entry->name, reg_ext, NullS);
strxmov(from_path, ddl_log_entry->from_name, reg_ext, NullS);
if (mysql_file_rename(key_file_frm, from_path, to_path, MYF(MY_WME)))
break;
#ifdef WITH_PARTITION_STORAGE_ENGINE
strxmov(to_path, ddl_log_entry->name, par_ext, NullS);
strxmov(from_path, ddl_log_entry->from_name, par_ext, NullS);
(void) mysql_file_rename(key_file_partition, from_path, to_path, MYF(MY_WME));
#endif
}
else
{
if (file->ha_rename_table(ddl_log_entry->from_name,
ddl_log_entry->name))
break;
}
if ((deactivate_ddl_log_entry_no_lock(ddl_log_entry->entry_pos)))
break;
(void) sync_ddl_log_no_lock();
error= FALSE;
break;
}
case DDL_LOG_EXCHANGE_ACTION:
{
/* We hold LOCK_gdl, so we can alter global_ddl_log.file_entry_buf */
char *file_entry_buf= (char*)&global_ddl_log.file_entry_buf;
/* not yet implemented for frm */
DBUG_ASSERT(!frm_action);
/*
Using a case-switch here to revert all currently done phases,
since it will fall through until the first phase is undone.
*/
switch (ddl_log_entry->phase) {
case EXCH_PHASE_TEMP_TO_FROM:
/* tmp_name -> from_name possibly done */
(void) file->ha_rename_table(ddl_log_entry->from_name,
ddl_log_entry->tmp_name);
/* decrease the phase and sync */
file_entry_buf[DDL_LOG_PHASE_POS]--;
if (write_ddl_log_file_entry(ddl_log_entry->entry_pos))
break;
if (sync_ddl_log_no_lock())
break;
/* fall through */
case EXCH_PHASE_FROM_TO_NAME:
/* from_name -> name possibly done */
(void) file->ha_rename_table(ddl_log_entry->name,
ddl_log_entry->from_name);
/* decrease the phase and sync */
file_entry_buf[DDL_LOG_PHASE_POS]--;
if (write_ddl_log_file_entry(ddl_log_entry->entry_pos))
break;
if (sync_ddl_log_no_lock())
break;
/* fall through */
case EXCH_PHASE_NAME_TO_TEMP:
/* name -> tmp_name possibly done */
(void) file->ha_rename_table(ddl_log_entry->tmp_name,
ddl_log_entry->name);
/* disable the entry and sync */
file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]= DDL_IGNORE_LOG_ENTRY_CODE;
if (write_ddl_log_file_entry(ddl_log_entry->entry_pos))
break;
if (sync_ddl_log_no_lock())
break;
error= FALSE;
break;
default:
DBUG_ASSERT(0);
break;
}
break;
}
default:
DBUG_ASSERT(0);
break;
}
delete file;
error:
free_root(&mem_root, MYF(0));
DBUG_RETURN(error);
}
/**
Get a free entry in the ddl log
@param[out] active_entry A ddl log memory entry returned
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool get_free_ddl_log_entry(DDL_LOG_MEMORY_ENTRY **active_entry,
bool *write_header)
{
DDL_LOG_MEMORY_ENTRY *used_entry;
DDL_LOG_MEMORY_ENTRY *first_used= global_ddl_log.first_used;
DBUG_ENTER("get_free_ddl_log_entry");
if (global_ddl_log.first_free == NULL)
{
if (!(used_entry= (DDL_LOG_MEMORY_ENTRY*)my_malloc(
sizeof(DDL_LOG_MEMORY_ENTRY), MYF(MY_WME))))
{
sql_print_error("Failed to allocate memory for ddl log free list");
DBUG_RETURN(TRUE);
}
global_ddl_log.num_entries++;
used_entry->entry_pos= global_ddl_log.num_entries;
*write_header= TRUE;
}
else
{
used_entry= global_ddl_log.first_free;
global_ddl_log.first_free= used_entry->next_log_entry;
*write_header= FALSE;
}
/*
Move from free list to used list
*/
used_entry->next_log_entry= first_used;
used_entry->prev_log_entry= NULL;
used_entry->next_active_log_entry= NULL;
global_ddl_log.first_used= used_entry;
if (first_used)
first_used->prev_log_entry= used_entry;
*active_entry= used_entry;
DBUG_RETURN(FALSE);
}
/**
Execute one entry in the ddl log.
Executing an entry means executing a linked list of actions.
@param first_entry Reference to first action in entry
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
static bool execute_ddl_log_entry_no_lock(THD *thd, uint first_entry)
{
DDL_LOG_ENTRY ddl_log_entry;
uint read_entry= first_entry;
DBUG_ENTER("execute_ddl_log_entry_no_lock");
mysql_mutex_assert_owner(&LOCK_gdl);
do
{
if (read_ddl_log_entry(read_entry, &ddl_log_entry))
{
/* Write to error log and continue with next log entry */
sql_print_error("Failed to read entry = %u from ddl log",
read_entry);
break;
}
DBUG_ASSERT(ddl_log_entry.entry_type == DDL_LOG_ENTRY_CODE ||
ddl_log_entry.entry_type == DDL_IGNORE_LOG_ENTRY_CODE);
if (execute_ddl_log_action(thd, &ddl_log_entry))
{
/* Write to error log and continue with next log entry */
sql_print_error("Failed to execute action for entry = %u from ddl log",
read_entry);
break;
}
read_entry= ddl_log_entry.next_entry;
} while (read_entry);
DBUG_RETURN(FALSE);
}
/*
External interface methods for the DDL log Module
---------------------------------------------------
*/
/**
Write a ddl log entry.
A careful write of the ddl log is performed to ensure that we can
handle crashes occurring during CREATE and ALTER TABLE processing.
@param ddl_log_entry Information about log entry
@param[out] entry_written Entry information written into
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
bool write_ddl_log_entry(DDL_LOG_ENTRY *ddl_log_entry,
DDL_LOG_MEMORY_ENTRY **active_entry)
{
bool error, write_header;
DBUG_ENTER("write_ddl_log_entry");
mysql_mutex_assert_owner(&LOCK_gdl);
if (init_ddl_log())
{
DBUG_RETURN(TRUE);
}
set_global_from_ddl_log_entry(ddl_log_entry);
if (get_free_ddl_log_entry(active_entry, &write_header))
{
DBUG_RETURN(TRUE);
}
error= FALSE;
DBUG_PRINT("ddl_log",
("write type %c next %u name '%s' from_name '%s' handler '%s'"
" tmp_name '%s'",
(char) global_ddl_log.file_entry_buf[DDL_LOG_ACTION_TYPE_POS],
ddl_log_entry->next_entry,
(char*) &global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS],
(char*) &global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS
+ FN_REFLEN],
(char*) &global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS
+ (2*FN_REFLEN)],
(char*) &global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS
+ (3*FN_REFLEN)]));
if (write_ddl_log_file_entry((*active_entry)->entry_pos))
{
error= TRUE;
sql_print_error("Failed to write entry_no = %u",
(*active_entry)->entry_pos);
}
if (write_header && !error)
{
(void) sync_ddl_log_no_lock();
if (write_ddl_log_header())
error= TRUE;
}
if (error)
release_ddl_log_memory_entry(*active_entry);
DBUG_RETURN(error);
}
/**
@brief Write final entry in the ddl log.
@details This is the last write in the ddl log. The previous log entries
have already been written but not yet synched to disk.
We write a couple of log entries that describes action to perform.
This entries are set-up in a linked list, however only when a first
execute entry is put as the first entry these will be executed.
This routine writes this first.
@param first_entry First entry in linked list of entries
to execute, if 0 = NULL it means that
the entry is removed and the entries
are put into the free list.
@param complete Flag indicating we are simply writing
info about that entry has been completed
@param[in,out] active_entry Entry to execute, 0 = NULL if the entry
is written first time and needs to be
returned. In this case the entry written
is returned in this parameter
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
bool write_execute_ddl_log_entry(uint first_entry,
bool complete,
DDL_LOG_MEMORY_ENTRY **active_entry)
{
bool write_header= FALSE;
char *file_entry_buf= (char*)global_ddl_log.file_entry_buf;
DBUG_ENTER("write_execute_ddl_log_entry");
mysql_mutex_assert_owner(&LOCK_gdl);
if (init_ddl_log())
{
DBUG_RETURN(TRUE);
}
if (!complete)
{
/*
We haven't synched the log entries yet, we synch them now before
writing the execute entry. If complete is true we haven't written
any log entries before, we are only here to write the execute
entry to indicate it is done.
*/
(void) sync_ddl_log_no_lock();
file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]= (char)DDL_LOG_EXECUTE_CODE;
}
else
file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]= (char)DDL_IGNORE_LOG_ENTRY_CODE;
file_entry_buf[DDL_LOG_ACTION_TYPE_POS]= 0; /* Ignored for execute entries */
file_entry_buf[DDL_LOG_PHASE_POS]= 0;
int4store(&file_entry_buf[DDL_LOG_NEXT_ENTRY_POS], first_entry);
file_entry_buf[DDL_LOG_NAME_POS]= 0;
file_entry_buf[DDL_LOG_NAME_POS + FN_REFLEN]= 0;
file_entry_buf[DDL_LOG_NAME_POS + 2*FN_REFLEN]= 0;
if (!(*active_entry))
{
if (get_free_ddl_log_entry(active_entry, &write_header))
{
DBUG_RETURN(TRUE);
}
write_header= TRUE;
}
if (write_ddl_log_file_entry((*active_entry)->entry_pos))
{
sql_print_error("Error writing execute entry in ddl log");
release_ddl_log_memory_entry(*active_entry);
DBUG_RETURN(TRUE);
}
(void) sync_ddl_log_no_lock();
if (write_header)
{
if (write_ddl_log_header())
{
release_ddl_log_memory_entry(*active_entry);
DBUG_RETURN(TRUE);
}
}
DBUG_RETURN(FALSE);
}
/**
Deactivate an individual entry.
@details see deactivate_ddl_log_entry_no_lock.
@param entry_no Entry position of record to change
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
bool deactivate_ddl_log_entry(uint entry_no)
{
bool error;
DBUG_ENTER("deactivate_ddl_log_entry");
mysql_mutex_lock(&LOCK_gdl);
error= deactivate_ddl_log_entry_no_lock(entry_no);
mysql_mutex_unlock(&LOCK_gdl);
DBUG_RETURN(error);
}
/**
Sync ddl log file.
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
bool sync_ddl_log()
{
bool error;
DBUG_ENTER("sync_ddl_log");
mysql_mutex_lock(&LOCK_gdl);
error= sync_ddl_log_no_lock();
mysql_mutex_unlock(&LOCK_gdl);
DBUG_RETURN(error);
}
/**
Release a log memory entry.
@param log_memory_entry Log memory entry to release
*/
void release_ddl_log_memory_entry(DDL_LOG_MEMORY_ENTRY *log_entry)
{
DDL_LOG_MEMORY_ENTRY *first_free= global_ddl_log.first_free;
DDL_LOG_MEMORY_ENTRY *next_log_entry= log_entry->next_log_entry;
DDL_LOG_MEMORY_ENTRY *prev_log_entry= log_entry->prev_log_entry;
DBUG_ENTER("release_ddl_log_memory_entry");
mysql_mutex_assert_owner(&LOCK_gdl);
global_ddl_log.first_free= log_entry;
log_entry->next_log_entry= first_free;
if (prev_log_entry)
prev_log_entry->next_log_entry= next_log_entry;
else
global_ddl_log.first_used= next_log_entry;
if (next_log_entry)
next_log_entry->prev_log_entry= prev_log_entry;
DBUG_VOID_RETURN;
}
/**
Execute one entry in the ddl log.
Executing an entry means executing a linked list of actions.
@param first_entry Reference to first action in entry
@return Operation status
@retval TRUE Error
@retval FALSE Success
*/
bool execute_ddl_log_entry(THD *thd, uint first_entry)
{
bool error;
DBUG_ENTER("execute_ddl_log_entry");
mysql_mutex_lock(&LOCK_gdl);
error= execute_ddl_log_entry_no_lock(thd, first_entry);
mysql_mutex_unlock(&LOCK_gdl);
DBUG_RETURN(error);
}
/**
Close the ddl log.
*/
static void close_ddl_log()
{
DBUG_ENTER("close_ddl_log");
if (global_ddl_log.file_id >= 0)
{
(void) mysql_file_close(global_ddl_log.file_id, MYF(MY_WME));
global_ddl_log.file_id= (File) -1;
}
DBUG_VOID_RETURN;
}
/**
Execute the ddl log at recovery of MySQL Server.
*/
void execute_ddl_log_recovery()
{
uint num_entries, i;
THD *thd;
DDL_LOG_ENTRY ddl_log_entry;
char file_name[FN_REFLEN];
static char recover_query_string[]= "INTERNAL DDL LOG RECOVER IN PROGRESS";
DBUG_ENTER("execute_ddl_log_recovery");
/*
Initialise global_ddl_log struct
*/
bzero(global_ddl_log.file_entry_buf, sizeof(global_ddl_log.file_entry_buf));
global_ddl_log.inited= FALSE;
global_ddl_log.recovery_phase= TRUE;
global_ddl_log.io_size= IO_SIZE;
global_ddl_log.file_id= (File) -1;
/*
To be able to run this from boot, we allocate a temporary THD
*/
if (!(thd=new THD))
DBUG_VOID_RETURN;
thd->thread_stack= (char*) &thd;
thd->store_globals();
thd->set_query(recover_query_string, strlen(recover_query_string));
/* this also initialize LOCK_gdl */
num_entries= read_ddl_log_header();
mysql_mutex_lock(&LOCK_gdl);
for (i= 1; i < num_entries + 1; i++)
{
if (read_ddl_log_entry(i, &ddl_log_entry))
{
sql_print_error("Failed to read entry no = %u from ddl log",
i);
continue;
}
if (ddl_log_entry.entry_type == DDL_LOG_EXECUTE_CODE)
{
if (execute_ddl_log_entry_no_lock(thd, ddl_log_entry.next_entry))
{
/* Real unpleasant scenario but we continue anyways. */
continue;
}
}
}
close_ddl_log();
create_ddl_log_file_name(file_name);
(void) mysql_file_delete(key_file_global_ddl_log, file_name, MYF(0));
global_ddl_log.recovery_phase= FALSE;
mysql_mutex_unlock(&LOCK_gdl);
delete thd;
DBUG_VOID_RETURN;
}
/**
Release all memory allocated to the ddl log.
*/
void release_ddl_log()
{
DDL_LOG_MEMORY_ENTRY *free_list;
DDL_LOG_MEMORY_ENTRY *used_list;
DBUG_ENTER("release_ddl_log");
if (!global_ddl_log.do_release)
DBUG_VOID_RETURN;
mysql_mutex_lock(&LOCK_gdl);
free_list= global_ddl_log.first_free;
used_list= global_ddl_log.first_used;
while (used_list)
{
DDL_LOG_MEMORY_ENTRY *tmp= used_list->next_log_entry;
my_free(used_list);
used_list= tmp;
}
while (free_list)
{
DDL_LOG_MEMORY_ENTRY *tmp= free_list->next_log_entry;
my_free(free_list);
free_list= tmp;
}
close_ddl_log();
global_ddl_log.inited= 0;
mysql_mutex_unlock(&LOCK_gdl);
mysql_mutex_destroy(&LOCK_gdl);
global_ddl_log.do_release= false;
DBUG_VOID_RETURN;
}
/*
---------------------------------------------------------------------------
END MODULE DDL log
--------------------
---------------------------------------------------------------------------
*/
/**
@brief construct a temporary shadow file name.
@details Make a shadow file name used by ALTER TABLE to construct the
modified table (with keeping the original). The modified table is then
moved back as original table. The name must start with the temp file
prefix so it gets filtered out by table files listing routines.
@param[out] buff buffer to receive the constructed name
@param bufflen size of buff
@param lpt alter table data structure
@retval path length
*/
uint build_table_shadow_filename(char *buff, size_t bufflen,
ALTER_PARTITION_PARAM_TYPE *lpt)
{
char tmp_name[FN_REFLEN];
my_snprintf (tmp_name, sizeof (tmp_name), "%s-%s", tmp_file_prefix,
lpt->table_name);
return build_table_filename(buff, bufflen, lpt->db, tmp_name, "", FN_IS_TMP);
}
/*
SYNOPSIS
mysql_write_frm()
lpt Struct carrying many parameters needed for this
method
flags Flags as defined below
WFRM_INITIAL_WRITE If set we need to prepare table before
creating the frm file
WFRM_INSTALL_SHADOW If set we should install the new frm
WFRM_KEEP_SHARE If set we know that the share is to be
retained and thus we should ensure share
object is correct, if not set we don't
set the new partition syntax string since
we know the share object is destroyed.
WFRM_PACK_FRM If set we should pack the frm file and delete
the frm file
RETURN VALUES
TRUE Error
FALSE Success
DESCRIPTION
A support method that creates a new frm file and in this process it
regenerates the partition data. It works fine also for non-partitioned
tables since it only handles partitioned data if it exists.
*/
bool mysql_write_frm(ALTER_PARTITION_PARAM_TYPE *lpt, uint flags)
{
/*
Prepare table to prepare for writing a new frm file where the
partitions in add/drop state have temporarily changed their state
We set tmp_table to avoid get errors on naming of primary key index.
*/
int error= 0;
char path[FN_REFLEN+1];
char shadow_path[FN_REFLEN+1];
char shadow_frm_name[FN_REFLEN+1];
char frm_name[FN_REFLEN+1];
#ifdef WITH_PARTITION_STORAGE_ENGINE
char *part_syntax_buf;
uint syntax_len;
#endif
DBUG_ENTER("mysql_write_frm");
/*
Build shadow frm file name
*/
build_table_shadow_filename(shadow_path, sizeof(shadow_path) - 1, lpt);
strxmov(shadow_frm_name, shadow_path, reg_ext, NullS);
if (flags & WFRM_WRITE_SHADOW)
{
if (mysql_prepare_create_table(lpt->thd, lpt->create_info, lpt->alter_info,
&lpt->db_options, lpt->table->file,
&lpt->key_info_buffer, &lpt->key_count,
C_ALTER_TABLE))
{
DBUG_RETURN(TRUE);
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
{
partition_info *part_info= lpt->table->part_info;
if (part_info)
{
if (!(part_syntax_buf= generate_partition_syntax(part_info,
&syntax_len,
TRUE, TRUE,
lpt->create_info,
lpt->alter_info,
NULL)))
{
DBUG_RETURN(TRUE);
}
part_info->part_info_string= part_syntax_buf;
part_info->part_info_len= syntax_len;
}
}
#endif
/* Write shadow frm file */
lpt->create_info->table_options= lpt->db_options;
LEX_CUSTRING frm= build_frm_image(lpt->thd, lpt->table_name,
lpt->create_info,
lpt->alter_info->create_list,
lpt->key_count, lpt->key_info_buffer,
lpt->table->file);
if (!frm.str)
{
error= 1;
goto end;
}
int error= writefrm(shadow_path, lpt->db, lpt->table_name,
lpt->create_info->tmp_table(), frm.str, frm.length);
my_free(const_cast<uchar*>(frm.str));
if (error || lpt->table->file->ha_create_partitioning_metadata(shadow_path,
NULL, CHF_CREATE_FLAG))
{
mysql_file_delete(key_file_frm, shadow_frm_name, MYF(0));
error= 1;
goto end;
}
}
if (flags & WFRM_INSTALL_SHADOW)
{
#ifdef WITH_PARTITION_STORAGE_ENGINE
partition_info *part_info= lpt->part_info;
#endif
/*
Build frm file name
*/
build_table_filename(path, sizeof(path) - 1, lpt->db,
lpt->table_name, "", 0);
strxnmov(frm_name, sizeof(frm_name), path, reg_ext, NullS);
/*
When we are changing to use new frm file we need to ensure that we
don't collide with another thread in process to open the frm file.
We start by deleting the .frm file and possible .par file. Then we
write to the DDL log that we have completed the delete phase by
increasing the phase of the log entry. Next step is to rename the
new .frm file and the new .par file to the real name. After
completing this we write a new phase to the log entry that will
deactivate it.
*/
if (mysql_file_delete(key_file_frm, frm_name, MYF(MY_WME)) ||
#ifdef WITH_PARTITION_STORAGE_ENGINE
lpt->table->file->ha_create_partitioning_metadata(path, shadow_path,
CHF_DELETE_FLAG) ||
deactivate_ddl_log_entry(part_info->frm_log_entry->entry_pos) ||
(sync_ddl_log(), FALSE) ||
mysql_file_rename(key_file_frm,
shadow_frm_name, frm_name, MYF(MY_WME)) ||
lpt->table->file->ha_create_partitioning_metadata(path, shadow_path,
CHF_RENAME_FLAG))
#else
mysql_file_rename(key_file_frm,
shadow_frm_name, frm_name, MYF(MY_WME)))
#endif
{
error= 1;
goto err;
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (part_info && (flags & WFRM_KEEP_SHARE))
{
TABLE_SHARE *share= lpt->table->s;
char *tmp_part_syntax_str;
if (!(part_syntax_buf= generate_partition_syntax(part_info,
&syntax_len,
TRUE, TRUE,
lpt->create_info,
lpt->alter_info,
NULL)))
{
error= 1;
goto err;
}
if (share->partition_info_buffer_size < syntax_len + 1)
{
share->partition_info_buffer_size= syntax_len+1;
if (!(tmp_part_syntax_str= (char*) strmake_root(&share->mem_root,
part_syntax_buf,
syntax_len)))
{
error= 1;
goto err;
}
share->partition_info_str= tmp_part_syntax_str;
}
else
memcpy((char*) share->partition_info_str, part_syntax_buf,
syntax_len + 1);
share->partition_info_str_len= part_info->part_info_len= syntax_len;
part_info->part_info_string= part_syntax_buf;
}
#endif
err:
#ifdef WITH_PARTITION_STORAGE_ENGINE
deactivate_ddl_log_entry(part_info->frm_log_entry->entry_pos);
part_info->frm_log_entry= NULL;
(void) sync_ddl_log();
#endif
;
}
end:
DBUG_RETURN(error);
}
/*
SYNOPSIS
write_bin_log()
thd Thread object
clear_error is clear_error to be called
query Query to log
query_length Length of query
is_trans if the event changes either
a trans or non-trans engine.
RETURN VALUES
NONE
DESCRIPTION
Write the binlog if open, routine used in multiple places in this
file
*/
int write_bin_log(THD *thd, bool clear_error,
char const *query, ulong query_length, bool is_trans)
{
int error= 0;
if (mysql_bin_log.is_open())
{
int errcode= 0;
thd_proc_info(thd, "Writing to binlog");
if (clear_error)
thd->clear_error();
else
errcode= query_error_code(thd, TRUE);
error= thd->binlog_query(THD::STMT_QUERY_TYPE,
query, query_length, is_trans, FALSE, FALSE,
errcode);
thd_proc_info(thd, 0);
}
return error;
}
/*
delete (drop) tables.
SYNOPSIS
mysql_rm_table()
thd Thread handle
tables List of tables to delete
if_exists If 1, don't give error if one table doesn't exists
NOTES
Will delete all tables that can be deleted and give a compact error
messages for tables that could not be deleted.
If a table is in use, we will wait for all users to free the table
before dropping it
Wait if global_read_lock (FLUSH TABLES WITH READ LOCK) is set, but
not if under LOCK TABLES.
RETURN
FALSE OK. In this case ok packet is sent to user
TRUE Error
*/
bool mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists,
my_bool drop_temporary)
{
bool error;
Drop_table_error_handler err_handler;
TABLE_LIST *table;
DBUG_ENTER("mysql_rm_table");
/* Disable drop of enabled log tables, must be done before name locking */
for (table= tables; table; table= table->next_local)
{
if (check_if_log_table(table, TRUE, "DROP"))
DBUG_RETURN(true);
}
if (!drop_temporary)
{
if (!in_bootstrap)
{
for (table= tables; table; table= table->next_local)
{
LEX_STRING db_name= { table->db, table->db_length };
LEX_STRING table_name= { table->table_name, table->table_name_length };
if (table->open_type == OT_BASE_ONLY ||
!find_temporary_table(thd, table))
(void) delete_statistics_for_table(thd, &db_name, &table_name);
}
}
if (!thd->locked_tables_mode)
{
if (lock_table_names(thd, tables, NULL,
thd->variables.lock_wait_timeout, 0))
DBUG_RETURN(true);
}
else
{
for (table= tables; table; table= table->next_local)
{
if (is_temporary_table(table))
{
/*
A temporary table.
Don't try to find a corresponding MDL lock or assign it
to table->mdl_request.ticket. There can't be metadata
locks for temporary tables: they are local to the session.
Later in this function we release the MDL lock only if
table->mdl_requeset.ticket is not NULL. Thus here we
ensure that we won't release the metadata lock on the base
table locked with LOCK TABLES as a side effect of temporary
table drop.
*/
DBUG_ASSERT(table->mdl_request.ticket == NULL);
}
else
{
/*
Not a temporary table.
Since 'tables' list can't contain duplicates (this is ensured
by parser) it is safe to cache pointer to the TABLE instances
in its elements.
*/
table->table= find_table_for_mdl_upgrade(thd, table->db,
table->table_name, false);
if (!table->table)
DBUG_RETURN(true);
table->mdl_request.ticket= table->table->mdl_ticket;
}
}
}
}
/* mark for close and remove all cached entries */
thd->push_internal_handler(&err_handler);
error= mysql_rm_table_no_locks(thd, tables, if_exists, drop_temporary,
false, false, false);
thd->pop_internal_handler();
if (error)
DBUG_RETURN(TRUE);
my_ok(thd);
DBUG_RETURN(FALSE);
}
/**
Find the comment in the query.
That's auxiliary function to be used handling DROP TABLE [comment].
@param thd Thread handler
@param comment_pos How many characters to skip before the comment.
Can be either 9 for DROP TABLE or
17 for DROP TABLE IF EXISTS
@param comment_start returns the beginning of the comment if found.
@retval 0 no comment found
@retval >0 the lenght of the comment found
*/
static uint32 comment_length(THD *thd, uint32 comment_pos,
const char **comment_start)
{
/* We use uchar * here to make array indexing portable */
const uchar *query= (uchar*) thd->query();
const uchar *query_end= (uchar*) query + thd->query_length();
const uchar *const state_map= thd->charset()->state_map;
for (; query < query_end; query++)
{
if (state_map[static_cast<uchar>(*query)] == MY_LEX_SKIP)
continue;
if (comment_pos-- == 0)
break;
}
if (query > query_end - 3 /* comment can't be shorter than 4 */ ||
state_map[static_cast<uchar>(*query)] != MY_LEX_LONG_COMMENT || query[1] != '*')
return 0;
*comment_start= (char*) query;
for (query+= 3; query < query_end; query++)
{
if (query[-1] == '*' && query[0] == '/')
return (char*) query - *comment_start + 1;
}
return 0;
}
/**
Execute the drop of a normal or temporary table.
@param thd Thread handler
@param tables Tables to drop
@param if_exists If set, don't give an error if table doesn't exists.
In this case we give an warning of level 'NOTE'
@param drop_temporary Only drop temporary tables
@param drop_view Allow to delete VIEW .frm
@param dont_log_query Don't write query to log files. This will also not
generate warnings if the handler files doesn't exists
@param dont_free_locks Don't do automatic UNLOCK TABLE if no more locked
tables
@retval 0 ok
@retval 1 Error
@retval -1 Thread was killed
@note This function assumes that metadata locks have already been taken.
It is also assumed that the tables have been removed from TDC.
@note This function assumes that temporary tables to be dropped have
been pre-opened using corresponding table list elements.
@todo When logging to the binary log, we should log
tmp_tables and transactional tables as separate statements if we
are in a transaction; This is needed to get these tables into the
cached binary log that is only written on COMMIT.
The current code only writes DROP statements that only uses temporary
tables to the cache binary log. This should be ok on most cases, but
not all.
*/
int mysql_rm_table_no_locks(THD *thd, TABLE_LIST *tables, bool if_exists,
bool drop_temporary, bool drop_view,
bool dont_log_query,
bool dont_free_locks)
{
TABLE_LIST *table;
char path[FN_REFLEN + 1], wrong_tables_buff[160], *alias= NULL;
String wrong_tables(wrong_tables_buff, sizeof(wrong_tables_buff)-1,
system_charset_info);
uint path_length= 0;
int error= 0;
int non_temp_tables_count= 0;
bool foreign_key_error=0;
bool non_tmp_error= 0;
bool trans_tmp_table_deleted= 0, non_trans_tmp_table_deleted= 0;
bool non_tmp_table_deleted= 0;
bool is_drop_tmp_if_exists_added= 0;
bool one_table= tables->next_local == 0;
bool was_view= 0;
String built_query;
String built_trans_tmp_query, built_non_trans_tmp_query;
DBUG_ENTER("mysql_rm_table_no_locks");
wrong_tables.length(0);
/*
Prepares the drop statements that will be written into the binary
log as follows:
1 - If we are not processing a "DROP TEMPORARY" it prepares a
"DROP".
2 - A "DROP" may result in a "DROP TEMPORARY" but the opposite is
not true.
3 - If the current format is row, the IF EXISTS token needs to be
appended because one does not know if CREATE TEMPORARY was previously
written to the binary log.
4 - Add the IF_EXISTS token if necessary, i.e. if_exists is TRUE.
5 - For temporary tables, there is a need to differentiate tables
in transactional and non-transactional storage engines. For that,
reason, two types of drop statements are prepared.
The need to different the type of tables when dropping a temporary
table stems from the fact that such drop does not commit an ongoing
transaction and changes to non-transactional tables must be written
ahead of the transaction in some circumstances.
6- Slave SQL thread ignores all replicate-* filter rules
for temporary tables with 'IF EXISTS' clause. (See sql/sql_parse.cc:
mysql_execute_command() for details). These commands will be binlogged
as they are, even if the default database (from USE `db`) is not present
on the Slave. This can cause point in time recovery failures later
when user uses the slave's binlog to re-apply. Hence at the time of binary
logging, these commands will be written with fully qualified table names
and use `db` will be suppressed.
*/
if (!dont_log_query)
{
if (!drop_temporary)
{
const char *comment_start;
uint32 comment_len;
built_query.set_charset(system_charset_info);
if (if_exists)
built_query.append("DROP TABLE IF EXISTS ");
else
built_query.append("DROP TABLE ");
if ((comment_len= comment_length(thd, if_exists ? 17:9, &comment_start)))
{
built_query.append(comment_start, comment_len);
built_query.append(" ");
}
}
if (thd->is_current_stmt_binlog_format_row() || if_exists)
{
is_drop_tmp_if_exists_added= true;
built_trans_tmp_query.set_charset(system_charset_info);
built_trans_tmp_query.append("DROP TEMPORARY TABLE IF EXISTS ");
built_non_trans_tmp_query.set_charset(system_charset_info);
built_non_trans_tmp_query.append("DROP TEMPORARY TABLE IF EXISTS ");
}
else
{
built_trans_tmp_query.set_charset(system_charset_info);
built_trans_tmp_query.append("DROP TEMPORARY TABLE ");
built_non_trans_tmp_query.set_charset(system_charset_info);
built_non_trans_tmp_query.append("DROP TEMPORARY TABLE ");
}
}
for (table= tables; table; table= table->next_local)
{
bool is_trans= 0;
bool table_creation_was_logged= 1;
char *db=table->db;
size_t db_length= table->db_length;
handlerton *table_type= 0;
DBUG_PRINT("table", ("table_l: '%s'.'%s' table: 0x%lx s: 0x%lx",
table->db, table->table_name, (long) table->table,
table->table ? (long) table->table->s : (long) -1));
/*
If we are in locked tables mode and are dropping a temporary table,
the ticket should be NULL to ensure that we don't release a lock
on a base table later.
*/
DBUG_ASSERT(!(thd->locked_tables_mode &&
table->open_type != OT_BASE_ONLY &&
find_temporary_table(thd, table) &&
table->mdl_request.ticket != NULL));
/*
drop_temporary_table may return one of the following error codes:
. 0 - a temporary table was successfully dropped.
. 1 - a temporary table was not found.
. -1 - a temporary table is used by an outer statement.
*/
if (table->open_type == OT_BASE_ONLY || !is_temporary_table(table))
error= 1;
else
{
table_creation_was_logged= table->table->s->table_creation_was_logged;
if ((error= drop_temporary_table(thd, table->table, &is_trans)) == -1)
{
DBUG_ASSERT(thd->in_sub_stmt);
goto err;
}
table->table= 0;
}
if ((drop_temporary && if_exists) || !error)
{
/*
This handles the case of temporary tables. We have the following cases:
. "DROP TEMPORARY" was executed and a temporary table was affected
(i.e. drop_temporary && !error) or the if_exists was specified (i.e.
drop_temporary && if_exists).
. "DROP" was executed but a temporary table was affected (.i.e
!error).
*/
#ifndef DONT_LOG_DROP_OF_TEMPORARY_TABLES
table_creation_was_logged= 1;
#endif
if (!dont_log_query && table_creation_was_logged)
{
/*
If there is an error, we don't know the type of the engine
at this point. So, we keep it in the trx-cache.
*/
is_trans= error ? TRUE : is_trans;
if (is_trans)
trans_tmp_table_deleted= TRUE;
else
non_trans_tmp_table_deleted= TRUE;
String *built_ptr_query=
(is_trans ? &built_trans_tmp_query : &built_non_trans_tmp_query);
/*
Write the database name if it is not the current one or if
thd->db is NULL or 'IF EXISTS' clause is present in 'DROP TEMPORARY'
query.
*/
if (thd->db == NULL || strcmp(db,thd->db) != 0
|| is_drop_tmp_if_exists_added )
{
append_identifier(thd, built_ptr_query, db, db_length);
built_ptr_query->append(".");
}
append_identifier(thd, built_ptr_query, table->table_name,
table->table_name_length);
built_ptr_query->append(",");
}
/*
This means that a temporary table was droped and as such there
is no need to proceed with the code that tries to drop a regular
table.
*/
if (!error) continue;
}
else if (!drop_temporary)
{
non_temp_tables_count++;
DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db,
table->table_name,
MDL_SHARED));
alias= (lower_case_table_names == 2) ? table->alias : table->table_name;
/* remove .frm file and engine files */
path_length= build_table_filename(path, sizeof(path) - 1, db, alias,
reg_ext, 0);
/*
This handles the case where a "DROP" was executed and a regular
table "may be" dropped as drop_temporary is FALSE and error is
TRUE. If the error was FALSE a temporary table was dropped and
regardless of the status of drop_temporary a "DROP TEMPORARY"
must be used.
*/
if (!dont_log_query)
{
/*
Note that unless if_exists is TRUE or a temporary table was deleted,
there is no means to know if the statement should be written to the
binary log. See further information on this variable in what follows.
*/
non_tmp_table_deleted= (if_exists ? TRUE : non_tmp_table_deleted);
/*
Don't write the database name if it is the current one (or if
thd->db is NULL).
*/
if (thd->db == NULL || strcmp(db,thd->db) != 0)
{
append_identifier(thd, &built_query, db, db_length);
built_query.append(".");
}
append_identifier(thd, &built_query, table->table_name,
table->table_name_length);
built_query.append(",");
}
}
DEBUG_SYNC(thd, "rm_table_no_locks_before_delete_table");
error= 0;
if (drop_temporary ||
(ha_table_exists(thd, db, alias, &table_type) == 0 && table_type == 0) ||
(!drop_view && (was_view= (table_type == view_pseudo_hton))))
{
/*
One of the following cases happened:
. "DROP TEMPORARY" but a temporary table was not found.
. "DROP" but table was not found
. "DROP TABLE" statement, but it's a view.
*/
if (if_exists)
{
char buff[FN_REFLEN];
String tbl_name(buff, sizeof(buff), system_charset_info);
tbl_name.length(0);
tbl_name.append(db);
tbl_name.append('.');
tbl_name.append(table->table_name);
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_BAD_TABLE_ERROR, ER(ER_BAD_TABLE_ERROR),
tbl_name.c_ptr_safe());
}
else
{
non_tmp_error = (drop_temporary ? non_tmp_error : TRUE);
error= 1;
}
}
else
{
char *end;
/*
It could happen that table's share in the table definition cache
is the only thing that keeps the engine plugin loaded
(if it is uninstalled and waits for the ref counter to drop to 0).
In this case, the tdc_remove_table() below will release and unload
the plugin. And ha_delete_table() will get a dangling pointer.
Let's lock the plugin till the end of the statement.
*/
if (table_type && table_type != view_pseudo_hton)
ha_lock_engine(thd, table_type);
if (thd->locked_tables_mode)
{
if (wait_while_table_is_used(thd, table->table, HA_EXTRA_NOT_USED))
{
error= -1;
goto err;
}
/* the following internally does TDC_RT_REMOVE_ALL */
close_all_tables_for_name(thd, table->table->s,
HA_EXTRA_PREPARE_FOR_DROP, NULL);
table->table= 0;
}
else
tdc_remove_table(thd, TDC_RT_REMOVE_ALL, table->db, table->table_name,
false);
/* Check that we have an exclusive lock on the table to be dropped. */
DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db,
table->table_name,
MDL_EXCLUSIVE));
// Remove extension for delete
*(end= path + path_length - reg_ext_length)= '\0';
error= ha_delete_table(thd, table_type, path, db, table->table_name,
!dont_log_query);
if (error == HA_ERR_ROW_IS_REFERENCED)
{
/* the table is referenced by a foreign key constraint */
foreign_key_error= 1;
}
if (!error || error == ENOENT || error == HA_ERR_NO_SUCH_TABLE)
{
int frm_delete_error, trigger_drop_error= 0;
/* Delete the table definition file */
strmov(end,reg_ext);
frm_delete_error= mysql_file_delete(key_file_frm, path, MYF(MY_WME));
if (frm_delete_error)
frm_delete_error= my_errno;
else
{
non_tmp_table_deleted= TRUE;
trigger_drop_error=
Table_triggers_list::drop_all_triggers(thd, db, table->table_name);
}
if (trigger_drop_error ||
(frm_delete_error && frm_delete_error != ENOENT))
error= 1;
else if (!frm_delete_error || !error || if_exists)
{
error= 0;
thd->clear_error();
}
}
non_tmp_error= error ? TRUE : non_tmp_error;
}
if (error)
{
if (wrong_tables.length())
wrong_tables.append(',');
wrong_tables.append(db);
wrong_tables.append('.');
wrong_tables.append(table->table_name);
}
else
{
PSI_CALL_drop_table_share(false, table->db, table->db_length,
table->table_name, table->table_name_length);
mysql_audit_drop_table(thd, table);
}
DBUG_PRINT("table", ("table: 0x%lx s: 0x%lx", (long) table->table,
table->table ? (long) table->table->s : (long) -1));
DBUG_EXECUTE_IF("bug43138",
my_printf_error(ER_BAD_TABLE_ERROR,
ER(ER_BAD_TABLE_ERROR), MYF(0),
table->table_name););
}
DEBUG_SYNC(thd, "rm_table_no_locks_before_binlog");
thd->thread_specific_used|= (trans_tmp_table_deleted ||
non_trans_tmp_table_deleted);
error= 0;
err:
if (wrong_tables.length())
{
if (one_table && was_view)
my_printf_error(ER_IT_IS_A_VIEW, ER(ER_IT_IS_A_VIEW), MYF(0),
wrong_tables.c_ptr_safe());
else if (!foreign_key_error)
my_printf_error(ER_BAD_TABLE_ERROR, ER(ER_BAD_TABLE_ERROR), MYF(0),
wrong_tables.c_ptr_safe());
else
my_message(ER_ROW_IS_REFERENCED, ER(ER_ROW_IS_REFERENCED), MYF(0));
error= 1;
}
/*
We are always logging drop of temporary tables.
The reason is to handle the following case:
- Use statement based replication
- CREATE TEMPORARY TABLE foo (logged)
- set row based replication
- DROP TEMPORAY TABLE foo (needs to be logged)
This should be fixed so that we remember if creation of the
temporary table was logged and only log it if the creation was
logged.
*/
if (non_trans_tmp_table_deleted ||
trans_tmp_table_deleted || non_tmp_table_deleted)
{
query_cache_invalidate3(thd, tables, 0);
if (!dont_log_query && mysql_bin_log.is_open())
{
if (non_trans_tmp_table_deleted)
{
/* Chop of the last comma */
built_non_trans_tmp_query.chop();
built_non_trans_tmp_query.append(" /* generated by server */");
error |= thd->binlog_query(THD::STMT_QUERY_TYPE,
built_non_trans_tmp_query.ptr(),
built_non_trans_tmp_query.length(),
FALSE, FALSE,
is_drop_tmp_if_exists_added,
0);
}
if (trans_tmp_table_deleted)
{
/* Chop of the last comma */
built_trans_tmp_query.chop();
built_trans_tmp_query.append(" /* generated by server */");
error |= thd->binlog_query(THD::STMT_QUERY_TYPE,
built_trans_tmp_query.ptr(),
built_trans_tmp_query.length(),
TRUE, FALSE,
is_drop_tmp_if_exists_added,
0);
}
if (non_tmp_table_deleted)
{
/* Chop of the last comma */
built_query.chop();
built_query.append(" /* generated by server */");
int error_code = (non_tmp_error ?
(foreign_key_error ? ER_ROW_IS_REFERENCED : ER_BAD_TABLE_ERROR) : 0);
error |= thd->binlog_query(THD::STMT_QUERY_TYPE,
built_query.ptr(),
built_query.length(),
TRUE, FALSE, FALSE,
error_code);
}
}
}
if (!drop_temporary)
{
/*
Under LOCK TABLES we should release meta-data locks on the tables
which were dropped.
Leave LOCK TABLES mode if we managed to drop all tables which were
locked. Additional check for 'non_temp_tables_count' is to avoid
leaving LOCK TABLES mode if we have dropped only temporary tables.
*/
if (thd->locked_tables_mode)
{
if (thd->lock && thd->lock->table_count == 0 &&
non_temp_tables_count > 0 && !dont_free_locks)
{
thd->locked_tables_list.unlock_locked_tables(thd);
goto end;
}
for (table= tables; table; table= table->next_local)
{
/* Drop locks for all successfully dropped tables. */
if (table->table == NULL && table->mdl_request.ticket)
{
/*
Under LOCK TABLES we may have several instances of table open
and locked and therefore have to remove several metadata lock
requests associated with them.
*/
thd->mdl_context.release_all_locks_for_name(table->mdl_request.ticket);
}
}
}
/*
Rely on the caller to implicitly commit the transaction
and release metadata locks.
*/
}
end:
DBUG_RETURN(error);
}
/**
Log the drop of a table.
@param thd Thread handler
@param db_name Database name
@param table_name Table name
@param temporary_table 1 if table was a temporary table
This code is only used in the case of failed CREATE OR REPLACE TABLE
when the original table was dropped but we could not create the new one.
*/
bool log_drop_table(THD *thd, const char *db_name, size_t db_name_length,
const char *table_name, size_t table_name_length,
bool temporary_table)
{
char buff[NAME_LEN*2 + 80];
String query(buff, sizeof(buff), system_charset_info);
bool error;
DBUG_ENTER("log_drop_table");
if (!mysql_bin_log.is_open())
DBUG_RETURN(0);
query.length(0);
query.append(STRING_WITH_LEN("DROP "));
if (temporary_table)
query.append(STRING_WITH_LEN("TEMPORARY "));
query.append(STRING_WITH_LEN("TABLE IF EXISTS "));
append_identifier(thd, &query, db_name, db_name_length);
query.append(".");
append_identifier(thd, &query, table_name, table_name_length);
query.append(STRING_WITH_LEN("/* Generated to handle "
"failed CREATE OR REPLACE */"));
error= thd->binlog_query(THD::STMT_QUERY_TYPE,
query.ptr(), query.length(),
FALSE, FALSE, temporary_table, 0);
DBUG_RETURN(error);
}
/**
Quickly remove a table.
@param thd Thread context.
@param base The handlerton handle.
@param db The database name.
@param table_name The table name.
@param flags Flags for build_table_filename() as well as describing
if handler files / .FRM should be deleted as well.
@return False in case of success, True otherwise.
*/
bool quick_rm_table(THD *thd, handlerton *base, const char *db,
const char *table_name, uint flags)
{
char path[FN_REFLEN + 1];
bool error= 0;
DBUG_ENTER("quick_rm_table");
uint path_length= build_table_filename(path, sizeof(path) - 1,
db, table_name, reg_ext, flags);
if (mysql_file_delete(key_file_frm, path, MYF(0)))
error= 1; /* purecov: inspected */
path[path_length - reg_ext_length]= '\0'; // Remove reg_ext
if (flags & NO_HA_TABLE)
{
handler *file= get_new_handler((TABLE_SHARE*) 0, thd->mem_root, base);
if (!file)
DBUG_RETURN(true);
(void) file->ha_create_partitioning_metadata(path, NULL, CHF_DELETE_FLAG);
delete file;
}
if (!(flags & (FRM_ONLY|NO_HA_TABLE)))
error|= ha_delete_table(current_thd, base, path, db, table_name, 0);
if (likely(error == 0))
{
PSI_CALL_drop_table_share(flags & FN_IS_TMP, db, strlen(db),
table_name, strlen(table_name));
}
DBUG_RETURN(error);
}
/*
Sort keys in the following order:
- PRIMARY KEY
- UNIQUE keys where all column are NOT NULL
- UNIQUE keys that don't contain partial segments
- Other UNIQUE keys
- Normal keys
- Fulltext keys
This will make checking for duplicated keys faster and ensure that
PRIMARY keys are prioritized.
*/
static int sort_keys(KEY *a, KEY *b)
{
ulong a_flags= a->flags, b_flags= b->flags;
if (a_flags & HA_NOSAME)
{
if (!(b_flags & HA_NOSAME))
return -1;
if ((a_flags ^ b_flags) & HA_NULL_PART_KEY)
{
/* Sort NOT NULL keys before other keys */
return (a_flags & HA_NULL_PART_KEY) ? 1 : -1;
}
if (a->name == primary_key_name)
return -1;
if (b->name == primary_key_name)
return 1;
/* Sort keys don't containing partial segments before others */
if ((a_flags ^ b_flags) & HA_KEY_HAS_PART_KEY_SEG)
return (a_flags & HA_KEY_HAS_PART_KEY_SEG) ? 1 : -1;
}
else if (b_flags & HA_NOSAME)
return 1; // Prefer b
if ((a_flags ^ b_flags) & HA_FULLTEXT)
{
return (a_flags & HA_FULLTEXT) ? 1 : -1;
}
/*
Prefer original key order. usable_key_parts contains here
the original key position.
*/
return ((a->usable_key_parts < b->usable_key_parts) ? -1 :
(a->usable_key_parts > b->usable_key_parts) ? 1 :
0);
}
/*
Check TYPELIB (set or enum) for duplicates
SYNOPSIS
check_duplicates_in_interval()
set_or_name "SET" or "ENUM" string for warning message
name name of the checked column
typelib list of values for the column
dup_val_count returns count of duplicate elements
DESCRIPTION
This function prints an warning for each value in list
which has some duplicates on its right
RETURN VALUES
0 ok
1 Error
*/
bool check_duplicates_in_interval(const char *set_or_name,
const char *name, TYPELIB *typelib,
CHARSET_INFO *cs, unsigned int *dup_val_count)
{
TYPELIB tmp= *typelib;
const char **cur_value= typelib->type_names;
unsigned int *cur_length= typelib->type_lengths;
*dup_val_count= 0;
for ( ; tmp.count > 1; cur_value++, cur_length++)
{
tmp.type_names++;
tmp.type_lengths++;
tmp.count--;
if (find_type2(&tmp, (const char*)*cur_value, *cur_length, cs))
{
THD *thd= current_thd;
ErrConvString err(*cur_value, *cur_length, cs);
if (current_thd->is_strict_mode())
{
my_error(ER_DUPLICATED_VALUE_IN_TYPE, MYF(0),
name, err.ptr(), set_or_name);
return 1;
}
push_warning_printf(thd,Sql_condition::WARN_LEVEL_NOTE,
ER_DUPLICATED_VALUE_IN_TYPE,
ER(ER_DUPLICATED_VALUE_IN_TYPE),
name, err.ptr(), set_or_name);
(*dup_val_count)++;
}
}
return 0;
}
/*
Check TYPELIB (set or enum) max and total lengths
SYNOPSIS
calculate_interval_lengths()
cs charset+collation pair of the interval
typelib list of values for the column
max_length length of the longest item
tot_length sum of the item lengths
DESCRIPTION
After this function call:
- ENUM uses max_length
- SET uses tot_length.
RETURN VALUES
void
*/
void calculate_interval_lengths(CHARSET_INFO *cs, TYPELIB *interval,
uint32 *max_length, uint32 *tot_length)
{
const char **pos;
uint *len;
*max_length= *tot_length= 0;
for (pos= interval->type_names, len= interval->type_lengths;
*pos ; pos++, len++)
{
size_t length= cs->cset->numchars(cs, *pos, *pos + *len);
*tot_length+= length;
set_if_bigger(*max_length, (uint32)length);
}
}
/*
Prepare a create_table instance for packing
SYNOPSIS
prepare_create_field()
sql_field field to prepare for packing
blob_columns count for BLOBs
table_flags table flags
DESCRIPTION
This function prepares a Create_field instance.
Fields such as pack_flag are valid after this call.
RETURN VALUES
0 ok
1 Error
*/
int prepare_create_field(Create_field *sql_field,
uint *blob_columns,
longlong table_flags)
{
unsigned int dup_val_count;
DBUG_ENTER("prepare_create_field");
/*
This code came from mysql_prepare_create_table.
Indent preserved to make patching easier
*/
DBUG_ASSERT(sql_field->charset);
switch (sql_field->sql_type) {
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_LONG_BLOB:
sql_field->pack_flag=FIELDFLAG_BLOB |
pack_length_to_packflag(sql_field->pack_length -
portable_sizeof_char_ptr);
if (sql_field->charset->state & MY_CS_BINSORT)
sql_field->pack_flag|=FIELDFLAG_BINARY;
sql_field->length=8; // Unireg field length
sql_field->unireg_check=Field::BLOB_FIELD;
(*blob_columns)++;
break;
case MYSQL_TYPE_GEOMETRY:
#ifdef HAVE_SPATIAL
if (!(table_flags & HA_CAN_GEOMETRY))
{
my_printf_error(ER_CHECK_NOT_IMPLEMENTED, ER(ER_CHECK_NOT_IMPLEMENTED),
MYF(0), "GEOMETRY");
DBUG_RETURN(1);
}
sql_field->pack_flag=FIELDFLAG_GEOM |
pack_length_to_packflag(sql_field->pack_length -
portable_sizeof_char_ptr);
if (sql_field->charset->state & MY_CS_BINSORT)
sql_field->pack_flag|=FIELDFLAG_BINARY;
sql_field->length=8; // Unireg field length
sql_field->unireg_check=Field::BLOB_FIELD;
(*blob_columns)++;
break;
#else
my_printf_error(ER_FEATURE_DISABLED,ER(ER_FEATURE_DISABLED), MYF(0),
sym_group_geom.name, sym_group_geom.needed_define);
DBUG_RETURN(1);
#endif /*HAVE_SPATIAL*/
case MYSQL_TYPE_VARCHAR:
#ifndef QQ_ALL_HANDLERS_SUPPORT_VARCHAR
if (table_flags & HA_NO_VARCHAR)
{
/* convert VARCHAR to CHAR because handler is not yet up to date */
sql_field->sql_type= MYSQL_TYPE_VAR_STRING;
sql_field->pack_length= calc_pack_length(sql_field->sql_type,
(uint) sql_field->length);
if ((sql_field->length / sql_field->charset->mbmaxlen) >
MAX_FIELD_CHARLENGTH)
{
my_printf_error(ER_TOO_BIG_FIELDLENGTH, ER(ER_TOO_BIG_FIELDLENGTH),
MYF(0), sql_field->field_name,
static_cast<ulong>(MAX_FIELD_CHARLENGTH));
DBUG_RETURN(1);
}
}
#endif
/* fall through */
case MYSQL_TYPE_STRING:
sql_field->pack_flag=0;
if (sql_field->charset->state & MY_CS_BINSORT)
sql_field->pack_flag|=FIELDFLAG_BINARY;
break;
case MYSQL_TYPE_ENUM:
sql_field->pack_flag=pack_length_to_packflag(sql_field->pack_length) |
FIELDFLAG_INTERVAL;
if (sql_field->charset->state & MY_CS_BINSORT)
sql_field->pack_flag|=FIELDFLAG_BINARY;
sql_field->unireg_check=Field::INTERVAL_FIELD;
if (check_duplicates_in_interval("ENUM",sql_field->field_name,
sql_field->interval,
sql_field->charset, &dup_val_count))
DBUG_RETURN(1);
break;
case MYSQL_TYPE_SET:
sql_field->pack_flag=pack_length_to_packflag(sql_field->pack_length) |
FIELDFLAG_BITFIELD;
if (sql_field->charset->state & MY_CS_BINSORT)
sql_field->pack_flag|=FIELDFLAG_BINARY;
sql_field->unireg_check=Field::BIT_FIELD;
if (check_duplicates_in_interval("SET",sql_field->field_name,
sql_field->interval,
sql_field->charset, &dup_val_count))
DBUG_RETURN(1);
/* Check that count of unique members is not more then 64 */
if (sql_field->interval->count - dup_val_count > sizeof(longlong)*8)
{
my_error(ER_TOO_BIG_SET, MYF(0), sql_field->field_name);
DBUG_RETURN(1);
}
break;
case MYSQL_TYPE_DATE: // Rest of string types
case MYSQL_TYPE_NEWDATE:
case MYSQL_TYPE_TIME:
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIME2:
case MYSQL_TYPE_DATETIME2:
case MYSQL_TYPE_NULL:
sql_field->pack_flag=f_settype((uint) sql_field->sql_type);
break;
case MYSQL_TYPE_BIT:
/*
We have sql_field->pack_flag already set here, see
mysql_prepare_create_table().
*/
break;
case MYSQL_TYPE_NEWDECIMAL:
sql_field->pack_flag=(FIELDFLAG_NUMBER |
(sql_field->flags & UNSIGNED_FLAG ? 0 :
FIELDFLAG_DECIMAL) |
(sql_field->flags & ZEROFILL_FLAG ?
FIELDFLAG_ZEROFILL : 0) |
(sql_field->decimals << FIELDFLAG_DEC_SHIFT));
break;
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_TIMESTAMP2:
/* fall-through */
default:
sql_field->pack_flag=(FIELDFLAG_NUMBER |
(sql_field->flags & UNSIGNED_FLAG ? 0 :
FIELDFLAG_DECIMAL) |
(sql_field->flags & ZEROFILL_FLAG ?
FIELDFLAG_ZEROFILL : 0) |
f_settype((uint) sql_field->sql_type) |
(sql_field->decimals << FIELDFLAG_DEC_SHIFT));
break;
}
if (!(sql_field->flags & NOT_NULL_FLAG) ||
(sql_field->vcol_info)) /* Make virtual columns allow NULL values */
sql_field->pack_flag|= FIELDFLAG_MAYBE_NULL;
if (sql_field->flags & NO_DEFAULT_VALUE_FLAG)
sql_field->pack_flag|= FIELDFLAG_NO_DEFAULT;
DBUG_RETURN(0);
}
/*
Get character set from field object generated by parser using
default values when not set.
SYNOPSIS
get_sql_field_charset()
sql_field The sql_field object
create_info Info generated by parser
RETURN VALUES
cs Character set
*/
CHARSET_INFO* get_sql_field_charset(Create_field *sql_field,
HA_CREATE_INFO *create_info)
{
CHARSET_INFO *cs= sql_field->charset;
if (!cs)
cs= create_info->default_table_charset;
/*
table_charset is set only in ALTER TABLE t1 CONVERT TO CHARACTER SET csname
if we want change character set for all varchar/char columns.
But the table charset must not affect the BLOB fields, so don't
allow to change my_charset_bin to somethig else.
*/
if (create_info->table_charset && cs != &my_charset_bin)
cs= create_info->table_charset;
return cs;
}
/**
Modifies the first column definition whose SQL type is TIMESTAMP
by adding the features DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP.
@param column_definitions The list of column definitions, in the physical
order in which they appear in the table.
*/
void promote_first_timestamp_column(List<Create_field> *column_definitions)
{
List_iterator<Create_field> it(*column_definitions);
Create_field *column_definition;
while ((column_definition= it++) != NULL)
{
if (is_timestamp_type(column_definition->sql_type) || // TIMESTAMP
column_definition->unireg_check == Field::TIMESTAMP_OLD_FIELD) // Legacy
{
if ((column_definition->flags & NOT_NULL_FLAG) != 0 && // NOT NULL,
column_definition->def == NULL && // no constant default,
column_definition->unireg_check == Field::NONE) // no function default
{
DBUG_PRINT("info", ("First TIMESTAMP column '%s' was promoted to "
"DEFAULT CURRENT_TIMESTAMP ON UPDATE "
"CURRENT_TIMESTAMP",
column_definition->field_name
));
column_definition->unireg_check= Field::TIMESTAMP_DNUN_FIELD;
}
return;
}
}
}
/**
Check if there is a duplicate key. Report a warning for every duplicate key.
@param thd Thread context.
@param key Key to be checked.
@param key_info Key meta-data info.
@param key_list List of existing keys.
*/
static void check_duplicate_key(THD *thd,
Key *key, KEY *key_info,
List<Key> *key_list)
{
/*
We only check for duplicate indexes if it is requested and the
key is not auto-generated.
Check is requested if the key was explicitly created or altered
by the user (unless it's a foreign key).
*/
if (!key->key_create_info.check_for_duplicate_indexes || key->generated)
return;
List_iterator<Key> key_list_iterator(*key_list);
List_iterator<Key_part_spec> key_column_iterator(key->columns);
Key *k;
while ((k= key_list_iterator++))
{
// Looking for a similar key...
if (k == key)
break;
if (k->generated ||
(key->type != k->type) ||
(key->key_create_info.algorithm != k->key_create_info.algorithm) ||
(key->columns.elements != k->columns.elements))
{
// Keys are different.
continue;
}
/*
Keys 'key' and 'k' might be identical.
Check that the keys have identical columns in the same order.
*/
List_iterator<Key_part_spec> k_column_iterator(k->columns);
bool all_columns_are_identical= true;
key_column_iterator.rewind();
for (uint i= 0; i < key->columns.elements; ++i)
{
Key_part_spec *c1= key_column_iterator++;
Key_part_spec *c2= k_column_iterator++;
DBUG_ASSERT(c1 && c2);
if (my_strcasecmp(system_charset_info,
c1->field_name.str, c2->field_name.str) ||
(c1->length != c2->length))
{
all_columns_are_identical= false;
break;
}
}
// Report a warning if we have two identical keys.
if (all_columns_are_identical)
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_DUP_INDEX, ER(ER_DUP_INDEX),
key_info->name,
thd->lex->query_tables->db,
thd->lex->query_tables->table_name);
break;
}
}
}
/*
Preparation for table creation
SYNOPSIS
mysql_prepare_create_table()
thd Thread object.
create_info Create information (like MAX_ROWS).
alter_info List of columns and indexes to create
db_options INOUT Table options (like HA_OPTION_PACK_RECORD).
file The handler for the new table.
key_info_buffer OUT An array of KEY structs for the indexes.
key_count OUT The number of elements in the array.
create_table_mode C_ORDINARY_CREATE, C_ALTER_TABLE,
C_CREATE_SELECT, C_ASSISTED_DISCOVERY
DESCRIPTION
Prepares the table and key structures for table creation.
NOTES
sets create_info->varchar if the table has a varchar
RETURN VALUES
FALSE OK
TRUE error
*/
static int
mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
Alter_info *alter_info, uint *db_options,
handler *file, KEY **key_info_buffer,
uint *key_count, int create_table_mode)
{
const char *key_name;
Create_field *sql_field,*dup_field;
uint field,null_fields,blob_columns,max_key_length;
ulong record_offset= 0;
KEY *key_info;
KEY_PART_INFO *key_part_info;
int field_no,dup_no;
int select_field_pos,auto_increment=0;
List_iterator<Create_field> it(alter_info->create_list);
List_iterator<Create_field> it2(alter_info->create_list);
uint total_uneven_bit_length= 0;
int select_field_count= C_CREATE_SELECT(create_table_mode);
bool tmp_table= create_table_mode == C_ALTER_TABLE;
DBUG_ENTER("mysql_prepare_create_table");
select_field_pos= alter_info->create_list.elements - select_field_count;
null_fields=blob_columns=0;
create_info->varchar= 0;
max_key_length= file->max_key_length();
for (field_no=0; (sql_field=it++) ; field_no++)
{
CHARSET_INFO *save_cs;
/*
Initialize length from its original value (number of characters),
which was set in the parser. This is necessary if we're
executing a prepared statement for the second time.
*/
sql_field->length= sql_field->char_length;
/* Set field charset. */
save_cs= sql_field->charset= get_sql_field_charset(sql_field, create_info);
if ((sql_field->flags & BINCMP_FLAG) &&
!(sql_field->charset= find_bin_collation(sql_field->charset)))
DBUG_RETURN(TRUE);
/*
Convert the default value from client character
set into the column character set if necessary.
*/
if (sql_field->def &&
save_cs != sql_field->def->collation.collation &&
(sql_field->sql_type == MYSQL_TYPE_VAR_STRING ||
sql_field->sql_type == MYSQL_TYPE_STRING ||
sql_field->sql_type == MYSQL_TYPE_SET ||
sql_field->sql_type == MYSQL_TYPE_ENUM))
{
/*
Starting from 5.1 we work here with a copy of Create_field
created by the caller, not with the instance that was
originally created during parsing. It's OK to create
a temporary item and initialize with it a member of the
copy -- this item will be thrown away along with the copy
at the end of execution, and thus not introduce a dangling
pointer in the parsed tree of a prepared statement or a
stored procedure statement.
*/
sql_field->def= sql_field->def->safe_charset_converter(save_cs);
if (sql_field->def == NULL)
{
/* Could not convert */
my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name);
DBUG_RETURN(TRUE);
}
}
if (sql_field->sql_type == MYSQL_TYPE_SET ||
sql_field->sql_type == MYSQL_TYPE_ENUM)
{
uint32 dummy;
CHARSET_INFO *cs= sql_field->charset;
TYPELIB *interval= sql_field->interval;
/*
Create typelib from interval_list, and if necessary
convert strings from client character set to the
column character set.
*/
if (!interval)
{
/*
Create the typelib in runtime memory - we will free the
occupied memory at the same time when we free this
sql_field -- at the end of execution.
*/
interval= sql_field->interval= typelib(thd->mem_root,
sql_field->interval_list);
List_iterator<String> int_it(sql_field->interval_list);
String conv, *tmp;
char comma_buf[4]; /* 4 bytes for utf32 */
int comma_length= cs->cset->wc_mb(cs, ',', (uchar*) comma_buf,
(uchar*) comma_buf +
sizeof(comma_buf));
DBUG_ASSERT(comma_length > 0);
for (uint i= 0; (tmp= int_it++); i++)
{
size_t lengthsp;
if (String::needs_conversion(tmp->length(), tmp->charset(),
cs, &dummy))
{
uint cnv_errs;
conv.copy(tmp->ptr(), tmp->length(), tmp->charset(), cs, &cnv_errs);
interval->type_names[i]= strmake_root(thd->mem_root, conv.ptr(),
conv.length());
interval->type_lengths[i]= conv.length();
}
// Strip trailing spaces.
lengthsp= cs->cset->lengthsp(cs, interval->type_names[i],
interval->type_lengths[i]);
interval->type_lengths[i]= lengthsp;
((uchar *)interval->type_names[i])[lengthsp]= '\0';
if (sql_field->sql_type == MYSQL_TYPE_SET)
{
if (cs->coll->instr(cs, interval->type_names[i],
interval->type_lengths[i],
comma_buf, comma_length, NULL, 0))
{
ErrConvString err(tmp->ptr(), tmp->length(), cs);
my_error(ER_ILLEGAL_VALUE_FOR_TYPE, MYF(0), "set", err.ptr());
DBUG_RETURN(TRUE);
}
}
}
sql_field->interval_list.empty(); // Don't need interval_list anymore
}
if (sql_field->sql_type == MYSQL_TYPE_SET)
{
uint32 field_length;
if (sql_field->def != NULL)
{
char *not_used;
uint not_used2;
bool not_found= 0;
String str, *def= sql_field->def->val_str(&str);
if (def == NULL) /* SQL "NULL" maps to NULL */
{
if ((sql_field->flags & NOT_NULL_FLAG) != 0)
{
my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name);
DBUG_RETURN(TRUE);
}
/* else, NULL is an allowed value */
(void) find_set(interval, NULL, 0,
cs, &not_used, &not_used2, &not_found);
}
else /* not NULL */
{
(void) find_set(interval, def->ptr(), def->length(),
cs, &not_used, &not_used2, &not_found);
}
if (not_found)
{
my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name);
DBUG_RETURN(TRUE);
}
}
calculate_interval_lengths(cs, interval, &dummy, &field_length);
sql_field->length= field_length + (interval->count - 1);
}
else /* MYSQL_TYPE_ENUM */
{
uint32 field_length;
DBUG_ASSERT(sql_field->sql_type == MYSQL_TYPE_ENUM);
if (sql_field->def != NULL)
{
String str, *def= sql_field->def->val_str(&str);
if (def == NULL) /* SQL "NULL" maps to NULL */
{
if ((sql_field->flags & NOT_NULL_FLAG) != 0)
{
my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name);
DBUG_RETURN(TRUE);
}
/* else, the defaults yield the correct length for NULLs. */
}
else /* not NULL */
{
def->length(cs->cset->lengthsp(cs, def->ptr(), def->length()));
if (find_type2(interval, def->ptr(), def->length(), cs) == 0) /* not found */
{
my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name);
DBUG_RETURN(TRUE);
}
}
}
calculate_interval_lengths(cs, interval, &field_length, &dummy);
sql_field->length= field_length;
}
set_if_smaller(sql_field->length, MAX_FIELD_WIDTH-1);
}
if (sql_field->sql_type == MYSQL_TYPE_BIT)
{
sql_field->pack_flag= FIELDFLAG_NUMBER;
if (file->ha_table_flags() & HA_CAN_BIT_FIELD)
total_uneven_bit_length+= sql_field->length & 7;
else
sql_field->pack_flag|= FIELDFLAG_TREAT_BIT_AS_CHAR;
}
sql_field->create_length_to_internal_length();
if (prepare_blob_field(thd, sql_field))
DBUG_RETURN(TRUE);
if (!(sql_field->flags & NOT_NULL_FLAG))
null_fields++;
if (check_column_name(sql_field->field_name))
{
my_error(ER_WRONG_COLUMN_NAME, MYF(0), sql_field->field_name);
DBUG_RETURN(TRUE);
}
/* Check if we have used the same field name before */
for (dup_no=0; (dup_field=it2++) != sql_field; dup_no++)
{
if (my_strcasecmp(system_charset_info,
sql_field->field_name,
dup_field->field_name) == 0)
{
/*
If this was a CREATE ... SELECT statement, accept a field
redefinition if we are changing a field in the SELECT part
*/
if (field_no < select_field_pos || dup_no >= select_field_pos)
{
my_error(ER_DUP_FIELDNAME, MYF(0), sql_field->field_name);
DBUG_RETURN(TRUE);
}
else
{
/* Field redefined */
sql_field->def= dup_field->def;
sql_field->sql_type= dup_field->sql_type;
sql_field->charset= (dup_field->charset ?
dup_field->charset :
create_info->default_table_charset);
sql_field->length= dup_field->char_length;
sql_field->pack_length= dup_field->pack_length;
sql_field->key_length= dup_field->key_length;
sql_field->decimals= dup_field->decimals;
sql_field->create_length_to_internal_length();
sql_field->unireg_check= dup_field->unireg_check;
/*
We're making one field from two, the result field will have
dup_field->flags as flags. If we've incremented null_fields
because of sql_field->flags, decrement it back.
*/
if (!(sql_field->flags & NOT_NULL_FLAG))
null_fields--;
sql_field->flags= dup_field->flags;
sql_field->interval= dup_field->interval;
sql_field->vcol_info= dup_field->vcol_info;
sql_field->stored_in_db= dup_field->stored_in_db;
it2.remove(); // Remove first (create) definition
select_field_pos--;
break;
}
}
}
/* Don't pack rows in old tables if the user has requested this */
if ((sql_field->flags & BLOB_FLAG) ||
(sql_field->sql_type == MYSQL_TYPE_VARCHAR &&
create_info->row_type != ROW_TYPE_FIXED))
(*db_options)|= HA_OPTION_PACK_RECORD;
it2.rewind();
}
/* record_offset will be increased with 'length-of-null-bits' later */
record_offset= 0;
null_fields+= total_uneven_bit_length;
it.rewind();
while ((sql_field=it++))
{
DBUG_ASSERT(sql_field->charset != 0);
if (prepare_create_field(sql_field, &blob_columns,
file->ha_table_flags()))
DBUG_RETURN(TRUE);
if (sql_field->sql_type == MYSQL_TYPE_VARCHAR)
create_info->varchar= TRUE;
sql_field->offset= record_offset;
if (MTYP_TYPENR(sql_field->unireg_check) == Field::NEXT_NUMBER)
auto_increment++;
if (parse_option_list(thd, create_info->db_type, &sql_field->option_struct,
&sql_field->option_list,
create_info->db_type->field_options, FALSE,
thd->mem_root))
DBUG_RETURN(TRUE);
/*
For now skip fields that are not physically stored in the database
(virtual fields) and update their offset later
(see the next loop).
*/
if (sql_field->stored_in_db)
record_offset+= sql_field->pack_length;
}
/* Update virtual fields' offset*/
it.rewind();
while ((sql_field=it++))
{
if (!sql_field->stored_in_db)
{
sql_field->offset= record_offset;
record_offset+= sql_field->pack_length;
}
}
if (auto_increment > 1)
{
my_message(ER_WRONG_AUTO_KEY, ER(ER_WRONG_AUTO_KEY), MYF(0));
DBUG_RETURN(TRUE);
}
if (auto_increment &&
(file->ha_table_flags() & HA_NO_AUTO_INCREMENT))
{
my_error(ER_TABLE_CANT_HANDLE_AUTO_INCREMENT, MYF(0), file->table_type());
DBUG_RETURN(TRUE);
}
if (blob_columns && (file->ha_table_flags() & HA_NO_BLOBS))
{
my_error(ER_TABLE_CANT_HANDLE_BLOB, MYF(0), file->table_type());
DBUG_RETURN(TRUE);
}
/*
CREATE TABLE[with auto_increment column] SELECT is unsafe as the rows
inserted in the created table depends on the order of the rows fetched
from the select tables. This order may differ on master and slave. We
therefore mark it as unsafe.
*/
if (select_field_count > 0 && auto_increment)
thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_CREATE_SELECT_AUTOINC);
/* Create keys */
List_iterator<Key> key_iterator(alter_info->key_list);
List_iterator<Key> key_iterator2(alter_info->key_list);
uint key_parts=0, fk_key_count=0;
bool primary_key=0,unique_key=0;
Key *key, *key2;
uint tmp, key_number;
/* special marker for keys to be ignored */
static char ignore_key[1];
/* Calculate number of key segements */
*key_count= 0;
while ((key=key_iterator++))
{
DBUG_PRINT("info", ("key name: '%s' type: %d", key->name.str ? key->name.str :
"(none)" , key->type));
if (key->type == Key::FOREIGN_KEY)
{
fk_key_count++;
if (((Foreign_key *)key)->validate(alter_info->create_list))
DBUG_RETURN(TRUE);
Foreign_key *fk_key= (Foreign_key*) key;
if (fk_key->ref_columns.elements &&
fk_key->ref_columns.elements != fk_key->columns.elements)
{
my_error(ER_WRONG_FK_DEF, MYF(0),
(fk_key->name.str ? fk_key->name.str :
"foreign key without name"),
ER(ER_KEY_REF_DO_NOT_MATCH_TABLE_REF));
DBUG_RETURN(TRUE);
}
continue;
}
(*key_count)++;
tmp=file->max_key_parts();
if (key->columns.elements > tmp)
{
my_error(ER_TOO_MANY_KEY_PARTS,MYF(0),tmp);
DBUG_RETURN(TRUE);
}
if (check_string_char_length(&key->name, "", NAME_CHAR_LEN,
system_charset_info, 1))
{
my_error(ER_TOO_LONG_IDENT, MYF(0), key->name.str);
DBUG_RETURN(TRUE);
}
key_iterator2.rewind ();
if (key->type != Key::FOREIGN_KEY)
{
while ((key2 = key_iterator2++) != key)
{
/*
foreign_key_prefix(key, key2) returns 0 if key or key2, or both, is
'generated', and a generated key is a prefix of the other key.
Then we do not need the generated shorter key.
*/
if ((key2->type != Key::FOREIGN_KEY &&
key2->name.str != ignore_key &&
!foreign_key_prefix(key, key2)))
{
/* TODO: issue warning message */
/* mark that the generated key should be ignored */
if (!key2->generated ||
(key->generated && key->columns.elements <
key2->columns.elements))
key->name.str= ignore_key;
else
{
key2->name.str= ignore_key;
key_parts-= key2->columns.elements;
(*key_count)--;
}
break;
}
}
}
if (key->name.str != ignore_key)
key_parts+=key->columns.elements;
else
(*key_count)--;
if (key->name.str && !tmp_table && (key->type != Key::PRIMARY) &&
!my_strcasecmp(system_charset_info, key->name.str, primary_key_name))
{
my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key->name.str);
DBUG_RETURN(TRUE);
}
}
tmp=file->max_keys();
if (*key_count > tmp)
{
my_error(ER_TOO_MANY_KEYS,MYF(0),tmp);
DBUG_RETURN(TRUE);
}
(*key_info_buffer)= key_info= (KEY*) sql_calloc(sizeof(KEY) * (*key_count));
key_part_info=(KEY_PART_INFO*) sql_calloc(sizeof(KEY_PART_INFO)*key_parts);
if (!*key_info_buffer || ! key_part_info)
DBUG_RETURN(TRUE); // Out of memory
key_iterator.rewind();
key_number=0;
for (; (key=key_iterator++) ; key_number++)
{
uint key_length=0;
Key_part_spec *column;
if (key->name.str == ignore_key)
{
/* ignore redundant keys */
do
key=key_iterator++;
while (key && key->name.str == ignore_key);
if (!key)
break;
}
switch (key->type) {
case Key::MULTIPLE:
key_info->flags= 0;
break;
case Key::FULLTEXT:
key_info->flags= HA_FULLTEXT;
if ((key_info->parser_name= &key->key_create_info.parser_name)->str)
key_info->flags|= HA_USES_PARSER;
else
key_info->parser_name= 0;
break;
case Key::SPATIAL:
#ifdef HAVE_SPATIAL
key_info->flags= HA_SPATIAL;
break;
#else
my_error(ER_FEATURE_DISABLED, MYF(0),
sym_group_geom.name, sym_group_geom.needed_define);
DBUG_RETURN(TRUE);
#endif
case Key::FOREIGN_KEY:
key_number--; // Skip this key
continue;
default:
key_info->flags = HA_NOSAME;
break;
}
if (key->generated)
key_info->flags|= HA_GENERATED_KEY;
key_info->user_defined_key_parts=(uint8) key->columns.elements;
key_info->key_part=key_part_info;
key_info->usable_key_parts= key_number;
key_info->algorithm= key->key_create_info.algorithm;
key_info->option_list= key->option_list;
if (parse_option_list(thd, create_info->db_type, &key_info->option_struct,
&key_info->option_list,
create_info->db_type->index_options, FALSE,
thd->mem_root))
DBUG_RETURN(TRUE);
if (key->type == Key::FULLTEXT)
{
if (!(file->ha_table_flags() & HA_CAN_FULLTEXT))
{
my_error(ER_TABLE_CANT_HANDLE_FT, MYF(0), file->table_type());
DBUG_RETURN(TRUE);
}
}
/*
Make SPATIAL to be RTREE by default
SPATIAL only on BLOB or at least BINARY, this
actually should be replaced by special GEOM type
in near future when new frm file is ready
checking for proper key parts number:
*/
/* TODO: Add proper checks if handler supports key_type and algorithm */
if (key_info->flags & HA_SPATIAL)
{
if (!(file->ha_table_flags() & HA_CAN_RTREEKEYS))
{
my_error(ER_TABLE_CANT_HANDLE_SPKEYS, MYF(0), file->table_type());
DBUG_RETURN(TRUE);
}
if (key_info->user_defined_key_parts != 1)
{
my_error(ER_WRONG_ARGUMENTS, MYF(0), "SPATIAL INDEX");
DBUG_RETURN(TRUE);
}
}
else if (key_info->algorithm == HA_KEY_ALG_RTREE)
{
#ifdef HAVE_RTREE_KEYS
if ((key_info->user_defined_key_parts & 1) == 1)
{
my_error(ER_WRONG_ARGUMENTS, MYF(0), "RTREE INDEX");
DBUG_RETURN(TRUE);
}
/* TODO: To be deleted */
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "RTREE INDEX");
DBUG_RETURN(TRUE);
#else
my_error(ER_FEATURE_DISABLED, MYF(0),
sym_group_rtree.name, sym_group_rtree.needed_define);
DBUG_RETURN(TRUE);
#endif
}
/* Take block size from key part or table part */
/*
TODO: Add warning if block size changes. We can't do it here, as
this may depend on the size of the key
*/
key_info->block_size= (key->key_create_info.block_size ?
key->key_create_info.block_size :
create_info->key_block_size);
if (key_info->block_size)
key_info->flags|= HA_USES_BLOCK_SIZE;
List_iterator<Key_part_spec> cols(key->columns), cols2(key->columns);
CHARSET_INFO *ft_key_charset=0; // for FULLTEXT
for (uint column_nr=0 ; (column=cols++) ; column_nr++)
{
Key_part_spec *dup_column;
it.rewind();
field=0;
while ((sql_field=it++) &&
my_strcasecmp(system_charset_info,
column->field_name.str,
sql_field->field_name))
field++;
if (!sql_field)
{
my_error(ER_KEY_COLUMN_DOES_NOT_EXITS, MYF(0), column->field_name.str);
DBUG_RETURN(TRUE);
}
while ((dup_column= cols2++) != column)
{
if (!my_strcasecmp(system_charset_info,
column->field_name.str, dup_column->field_name.str))
{
my_printf_error(ER_DUP_FIELDNAME,
ER(ER_DUP_FIELDNAME),MYF(0),
column->field_name.str);
DBUG_RETURN(TRUE);
}
}
cols2.rewind();
if (key->type == Key::FULLTEXT)
{
if ((sql_field->sql_type != MYSQL_TYPE_STRING &&
sql_field->sql_type != MYSQL_TYPE_VARCHAR &&
!f_is_blob(sql_field->pack_flag)) ||
sql_field->charset == &my_charset_bin ||
sql_field->charset->mbminlen > 1 || // ucs2 doesn't work yet
(ft_key_charset && sql_field->charset != ft_key_charset))
{
my_error(ER_BAD_FT_COLUMN, MYF(0), column->field_name.str);
DBUG_RETURN(-1);
}
ft_key_charset=sql_field->charset;
/*
for fulltext keys keyseg length is 1 for blobs (it's ignored in ft
code anyway, and 0 (set to column width later) for char's. it has
to be correct col width for char's, as char data are not prefixed
with length (unlike blobs, where ft code takes data length from a
data prefix, ignoring column->length).
*/
column->length= MY_TEST(f_is_blob(sql_field->pack_flag));
}
else
{
column->length*= sql_field->charset->mbmaxlen;
if (key->type == Key::SPATIAL)
{
if (column->length)
{
my_error(ER_WRONG_SUB_KEY, MYF(0));
DBUG_RETURN(TRUE);
}
if (!f_is_geom(sql_field->pack_flag))
{
my_error(ER_WRONG_ARGUMENTS, MYF(0), "SPATIAL INDEX");
DBUG_RETURN(TRUE);
}
}
if (f_is_blob(sql_field->pack_flag) ||
(f_is_geom(sql_field->pack_flag) && key->type != Key::SPATIAL))
{
if (!(file->ha_table_flags() & HA_CAN_INDEX_BLOBS))
{
my_error(ER_BLOB_USED_AS_KEY, MYF(0), column->field_name.str,
file->table_type());
DBUG_RETURN(TRUE);
}
if (f_is_geom(sql_field->pack_flag) && sql_field->geom_type ==
Field::GEOM_POINT)
column->length= MAX_LEN_GEOM_POINT_FIELD;
if (!column->length)
{
my_error(ER_BLOB_KEY_WITHOUT_LENGTH, MYF(0), column->field_name.str);
DBUG_RETURN(TRUE);
}
}
#ifdef HAVE_SPATIAL
if (key->type == Key::SPATIAL)
{
if (!column->length)
{
/*
4 is: (Xmin,Xmax,Ymin,Ymax), this is for 2D case
Lately we'll extend this code to support more dimensions
*/
column->length= 4*sizeof(double);
}
}
#endif
if (!sql_field->stored_in_db)
{
/* Key fields must always be physically stored. */
my_error(ER_KEY_BASED_ON_GENERATED_VIRTUAL_COLUMN, MYF(0));
DBUG_RETURN(TRUE);
}
if (key->type == Key::PRIMARY && sql_field->vcol_info)
{
my_error(ER_PRIMARY_KEY_BASED_ON_VIRTUAL_COLUMN, MYF(0));
DBUG_RETURN(TRUE);
}
if (!(sql_field->flags & NOT_NULL_FLAG))
{
if (key->type == Key::PRIMARY)
{
/* Implicitly set primary key fields to NOT NULL for ISO conf. */
sql_field->flags|= NOT_NULL_FLAG;
sql_field->pack_flag&= ~FIELDFLAG_MAYBE_NULL;
null_fields--;
}
else
{
key_info->flags|= HA_NULL_PART_KEY;
if (!(file->ha_table_flags() & HA_NULL_IN_KEY))
{
my_error(ER_NULL_COLUMN_IN_INDEX, MYF(0), column->field_name.str);
DBUG_RETURN(TRUE);
}
if (key->type == Key::SPATIAL)
{
my_message(ER_SPATIAL_CANT_HAVE_NULL,
ER(ER_SPATIAL_CANT_HAVE_NULL), MYF(0));
DBUG_RETURN(TRUE);
}
}
}
if (MTYP_TYPENR(sql_field->unireg_check) == Field::NEXT_NUMBER)
{
if (column_nr == 0 || (file->ha_table_flags() & HA_AUTO_PART_KEY))
auto_increment--; // Field is used
}
}
key_part_info->fieldnr= field;
key_part_info->offset= (uint16) sql_field->offset;
key_part_info->key_type=sql_field->pack_flag;
uint key_part_length= sql_field->key_length;
if (column->length)
{
if (f_is_blob(sql_field->pack_flag))
{
key_part_length= MY_MIN(column->length,
blob_length_by_type(sql_field->sql_type)
* sql_field->charset->mbmaxlen);
if (key_part_length > max_key_length ||
key_part_length > file->max_key_part_length())
{
key_part_length= MY_MIN(max_key_length, file->max_key_part_length());
if (key->type == Key::MULTIPLE)
{
/* not a critical problem */
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_TOO_LONG_KEY, ER(ER_TOO_LONG_KEY),
key_part_length);
/* Align key length to multibyte char boundary */
key_part_length-= key_part_length % sql_field->charset->mbmaxlen;
}
else
{
my_error(ER_TOO_LONG_KEY, MYF(0), key_part_length);
DBUG_RETURN(TRUE);
}
}
}
// Catch invalid use of partial keys
else if (!f_is_geom(sql_field->pack_flag) &&
// is the key partial?
column->length != key_part_length &&
// is prefix length bigger than field length?
(column->length > key_part_length ||
// can the field have a partial key?
!Field::type_can_have_key_part (sql_field->sql_type) ||
// a packed field can't be used in a partial key
f_is_packed(sql_field->pack_flag) ||
// does the storage engine allow prefixed search?
((file->ha_table_flags() & HA_NO_PREFIX_CHAR_KEYS) &&
// and is this a 'unique' key?
(key_info->flags & HA_NOSAME))))
{
my_message(ER_WRONG_SUB_KEY, ER(ER_WRONG_SUB_KEY), MYF(0));
DBUG_RETURN(TRUE);
}
else if (!(file->ha_table_flags() & HA_NO_PREFIX_CHAR_KEYS))
key_part_length= column->length;
}
else if (key_part_length == 0 && (sql_field->flags & NOT_NULL_FLAG))
{
my_error(ER_WRONG_KEY_COLUMN, MYF(0), file->table_type(),
column->field_name.str);
DBUG_RETURN(TRUE);
}
if (key_part_length > file->max_key_part_length() &&
key->type != Key::FULLTEXT)
{
key_part_length= file->max_key_part_length();
if (key->type == Key::MULTIPLE)
{
/* not a critical problem */
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_TOO_LONG_KEY, ER(ER_TOO_LONG_KEY),
key_part_length);
/* Align key length to multibyte char boundary */
key_part_length-= key_part_length % sql_field->charset->mbmaxlen;
}
else
{
my_error(ER_TOO_LONG_KEY, MYF(0), key_part_length);
DBUG_RETURN(TRUE);
}
}
key_part_info->length= (uint16) key_part_length;
/* Use packed keys for long strings on the first column */
if (!((*db_options) & HA_OPTION_NO_PACK_KEYS) &&
!((create_info->table_options & HA_OPTION_NO_PACK_KEYS)) &&
(key_part_length >= KEY_DEFAULT_PACK_LENGTH &&
(sql_field->sql_type == MYSQL_TYPE_STRING ||
sql_field->sql_type == MYSQL_TYPE_VARCHAR ||
sql_field->pack_flag & FIELDFLAG_BLOB)))
{
if ((column_nr == 0 && (sql_field->pack_flag & FIELDFLAG_BLOB)) ||
sql_field->sql_type == MYSQL_TYPE_VARCHAR)
key_info->flags|= HA_BINARY_PACK_KEY | HA_VAR_LENGTH_KEY;
else
key_info->flags|= HA_PACK_KEY;
}
/* Check if the key segment is partial, set the key flag accordingly */
if (key_part_length != sql_field->key_length)
key_info->flags|= HA_KEY_HAS_PART_KEY_SEG;
key_length+= key_part_length;
key_part_info++;
/* Create the key name based on the first column (if not given) */
if (column_nr == 0)
{
if (key->type == Key::PRIMARY)
{
if (primary_key)
{
my_message(ER_MULTIPLE_PRI_KEY, ER(ER_MULTIPLE_PRI_KEY),
MYF(0));
DBUG_RETURN(TRUE);
}
key_name=primary_key_name;
primary_key=1;
}
else if (!(key_name= key->name.str))
key_name=make_unique_key_name(sql_field->field_name,
*key_info_buffer, key_info);
if (check_if_keyname_exists(key_name, *key_info_buffer, key_info))
{
my_error(ER_DUP_KEYNAME, MYF(0), key_name);
DBUG_RETURN(TRUE);
}
key_info->name=(char*) key_name;
}
}
if (!key_info->name || check_column_name(key_info->name))
{
my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key_info->name);
DBUG_RETURN(TRUE);
}
if (!(key_info->flags & HA_NULL_PART_KEY))
unique_key=1;
key_info->key_length=(uint16) key_length;
if (key_length > max_key_length && key->type != Key::FULLTEXT)
{
my_error(ER_TOO_LONG_KEY,MYF(0),max_key_length);
DBUG_RETURN(TRUE);
}
if (validate_comment_length(thd, &key->key_create_info.comment,
INDEX_COMMENT_MAXLEN, ER_TOO_LONG_INDEX_COMMENT,
key_info->name))
DBUG_RETURN(TRUE);
key_info->comment.length= key->key_create_info.comment.length;
if (key_info->comment.length > 0)
{
key_info->flags|= HA_USES_COMMENT;
key_info->comment.str= key->key_create_info.comment.str;
}
// Check if a duplicate index is defined.
check_duplicate_key(thd, key, key_info, &alter_info->key_list);
key_info++;
}
if (!unique_key && !primary_key &&
(file->ha_table_flags() & HA_REQUIRE_PRIMARY_KEY))
{
my_message(ER_REQUIRES_PRIMARY_KEY, ER(ER_REQUIRES_PRIMARY_KEY), MYF(0));
DBUG_RETURN(TRUE);
}
if (auto_increment > 0)
{
my_message(ER_WRONG_AUTO_KEY, ER(ER_WRONG_AUTO_KEY), MYF(0));
DBUG_RETURN(TRUE);
}
/* Sort keys in optimized order */
my_qsort((uchar*) *key_info_buffer, *key_count, sizeof(KEY),
(qsort_cmp) sort_keys);
create_info->null_bits= null_fields;
/* Check fields. */
it.rewind();
while ((sql_field=it++))
{
Field::utype type= (Field::utype) MTYP_TYPENR(sql_field->unireg_check);
if (thd->variables.sql_mode & MODE_NO_ZERO_DATE &&
!sql_field->def &&
is_timestamp_type(sql_field->sql_type) &&
(sql_field->flags & NOT_NULL_FLAG) &&
(type == Field::NONE || type == Field::TIMESTAMP_UN_FIELD))
{
/*
An error should be reported if:
- NO_ZERO_DATE SQL mode is active;
- there is no explicit DEFAULT clause (default column value);
- this is a TIMESTAMP column;
- the column is not NULL;
- this is not the DEFAULT CURRENT_TIMESTAMP column.
In other words, an error should be reported if
- NO_ZERO_DATE SQL mode is active;
- the column definition is equivalent to
'column_name TIMESTAMP DEFAULT 0'.
*/
my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name);
DBUG_RETURN(TRUE);
}
}
/* Give warnings for not supported table options */
#if defined(WITH_ARIA_STORAGE_ENGINE)
extern handlerton *maria_hton;
if (file->ht != maria_hton)
#endif
if (create_info->transactional)
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
ER_ILLEGAL_HA_CREATE_OPTION,
ER(ER_ILLEGAL_HA_CREATE_OPTION),
file->engine_name()->str,
"TRANSACTIONAL=1");
if (parse_option_list(thd, file->partition_ht(), &create_info->option_struct,
&create_info->option_list,
file->partition_ht()->table_options, FALSE,
thd->mem_root))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
/**
check comment length of table, column, index and partition
If comment lenght is more than the standard length
truncate it and store the comment lenght upto the standard
comment length size
@param thd Thread handle
@param[in,out] comment Comment
@param max_len Maximum allowed comment length
@param err_code Error message
@param name Name of commented object
@return Operation status
@retval true Error found
@retval false On Success
*/
bool validate_comment_length(THD *thd, LEX_STRING *comment, size_t max_len,
uint err_code, const char *name)
{
DBUG_ENTER("validate_comment_length");
uint tmp_len= my_charpos(system_charset_info, comment->str,
comment->str + comment->length, max_len);
if (tmp_len < comment->length)
{
if (thd->is_strict_mode())
{
my_error(err_code, MYF(0), name, static_cast<ulong>(max_len));
DBUG_RETURN(true);
}
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, err_code,
ER(err_code), name, static_cast<ulong>(max_len));
comment->length= tmp_len;
}
DBUG_RETURN(false);
}
/*
Set table default charset, if not set
SYNOPSIS
set_table_default_charset()
create_info Table create information
DESCRIPTION
If the table character set was not given explicitely,
let's fetch the database default character set and
apply it to the table.
*/
static void set_table_default_charset(THD *thd,
HA_CREATE_INFO *create_info, char *db)
{
/*
If the table character set was not given explicitly,
let's fetch the database default character set and
apply it to the table.
*/
if (!create_info->default_table_charset)
{
Schema_specification_st db_info;
load_db_opt_by_name(thd, db, &db_info);
create_info->default_table_charset= db_info.default_table_charset;
}
}
/*
Extend long VARCHAR fields to blob & prepare field if it's a blob
SYNOPSIS
prepare_blob_field()
sql_field Field to check
RETURN
0 ok
1 Error (sql_field can't be converted to blob)
In this case the error is given
*/
static bool prepare_blob_field(THD *thd, Create_field *sql_field)
{
DBUG_ENTER("prepare_blob_field");
if (sql_field->length > MAX_FIELD_VARCHARLENGTH &&
!(sql_field->flags & BLOB_FLAG))
{
/* Convert long VARCHAR columns to TEXT or BLOB */
char warn_buff[MYSQL_ERRMSG_SIZE];
if (sql_field->def || thd->is_strict_mode())
{
my_error(ER_TOO_BIG_FIELDLENGTH, MYF(0), sql_field->field_name,
static_cast<ulong>(MAX_FIELD_VARCHARLENGTH /
sql_field->charset->mbmaxlen));
DBUG_RETURN(1);
}
sql_field->sql_type= MYSQL_TYPE_BLOB;
sql_field->flags|= BLOB_FLAG;
my_snprintf(warn_buff, sizeof(warn_buff), ER(ER_AUTO_CONVERT), sql_field->field_name,
(sql_field->charset == &my_charset_bin) ? "VARBINARY" : "VARCHAR",
(sql_field->charset == &my_charset_bin) ? "BLOB" : "TEXT");
push_warning(thd, Sql_condition::WARN_LEVEL_NOTE, ER_AUTO_CONVERT,
warn_buff);
}
if ((sql_field->flags & BLOB_FLAG) && sql_field->length)
{
if (sql_field->sql_type == FIELD_TYPE_BLOB ||
sql_field->sql_type == FIELD_TYPE_TINY_BLOB ||
sql_field->sql_type == FIELD_TYPE_MEDIUM_BLOB)
{
/* The user has given a length to the blob column */
sql_field->sql_type= get_blob_type_from_length(sql_field->length);
sql_field->pack_length= calc_pack_length(sql_field->sql_type, 0);
}
sql_field->length= 0;
}
DBUG_RETURN(0);
}
/*
Preparation of Create_field for SP function return values.
Based on code used in the inner loop of mysql_prepare_create_table()
above.
SYNOPSIS
sp_prepare_create_field()
thd Thread object
sql_field Field to prepare
DESCRIPTION
Prepares the field structures for field creation.
*/
void sp_prepare_create_field(THD *thd, Create_field *sql_field)
{
if (sql_field->sql_type == MYSQL_TYPE_SET ||
sql_field->sql_type == MYSQL_TYPE_ENUM)
{
uint32 field_length, dummy;
if (sql_field->sql_type == MYSQL_TYPE_SET)
{
calculate_interval_lengths(sql_field->charset,
sql_field->interval, &dummy,
&field_length);
sql_field->length= field_length +
(sql_field->interval->count - 1);
}
else /* MYSQL_TYPE_ENUM */
{
calculate_interval_lengths(sql_field->charset,
sql_field->interval,
&field_length, &dummy);
sql_field->length= field_length;
}
set_if_smaller(sql_field->length, MAX_FIELD_WIDTH-1);
}
if (sql_field->sql_type == MYSQL_TYPE_BIT)
{
sql_field->pack_flag= FIELDFLAG_NUMBER |
FIELDFLAG_TREAT_BIT_AS_CHAR;
}
sql_field->create_length_to_internal_length();
DBUG_ASSERT(sql_field->def == 0);
/* Can't go wrong as sql_field->def is not defined */
(void) prepare_blob_field(thd, sql_field);
}
handler *mysql_create_frm_image(THD *thd,
const char *db, const char *table_name,
HA_CREATE_INFO *create_info,
Alter_info *alter_info, int create_table_mode,
KEY **key_info,
uint *key_count,
LEX_CUSTRING *frm)
{
uint db_options;
handler *file;
DBUG_ENTER("mysql_create_frm_image");
if (!alter_info->create_list.elements)
{
my_error(ER_TABLE_MUST_HAVE_COLUMNS, MYF(0));
DBUG_RETURN(NULL);
}
set_table_default_charset(thd, create_info, (char*) db);
db_options= create_info->table_options;
if (create_info->row_type == ROW_TYPE_DYNAMIC ||
create_info->row_type == ROW_TYPE_PAGE)
db_options|= HA_OPTION_PACK_RECORD;
if (!(file= get_new_handler((TABLE_SHARE*) 0, thd->mem_root,
create_info->db_type)))
{
mem_alloc_error(sizeof(handler));
DBUG_RETURN(NULL);
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
partition_info *part_info= thd->work_part_info;
if (!part_info && create_info->db_type->partition_flags &&
(create_info->db_type->partition_flags() & HA_USE_AUTO_PARTITION))
{
/*
Table is not defined as a partitioned table but the engine handles
all tables as partitioned. The handler will set up the partition info
object with the default settings.
*/
thd->work_part_info= part_info= new partition_info();
if (!part_info)
{
mem_alloc_error(sizeof(partition_info));
goto err;
}
file->set_auto_partitions(part_info);
part_info->default_engine_type= create_info->db_type;
part_info->is_auto_partitioned= TRUE;
}
if (part_info)
{
/*
The table has been specified as a partitioned table.
If this is part of an ALTER TABLE the handler will be the partition
handler but we need to specify the default handler to use for
partitions also in the call to check_partition_info. We transport
this information in the default_db_type variable, it is either
DB_TYPE_DEFAULT or the engine set in the ALTER TABLE command.
*/
handlerton *part_engine_type= create_info->db_type;
char *part_syntax_buf;
uint syntax_len;
handlerton *engine_type;
List_iterator<partition_element> part_it(part_info->partitions);
partition_element *part_elem;
while ((part_elem= part_it++))
{
if (part_elem->part_comment)
{
LEX_STRING comment= {
part_elem->part_comment, strlen(part_elem->part_comment)
};
if (validate_comment_length(thd, &comment,
TABLE_PARTITION_COMMENT_MAXLEN,
ER_TOO_LONG_TABLE_PARTITION_COMMENT,
part_elem->partition_name))
DBUG_RETURN(NULL);
part_elem->part_comment[comment.length]= '\0';
}
if (part_elem->subpartitions.elements)
{
List_iterator<partition_element> sub_it(part_elem->subpartitions);
partition_element *subpart_elem;
while ((subpart_elem= sub_it++))
{
if (subpart_elem->part_comment)
{
LEX_STRING comment= {
subpart_elem->part_comment, strlen(subpart_elem->part_comment)
};
if (validate_comment_length(thd, &comment,
TABLE_PARTITION_COMMENT_MAXLEN,
ER_TOO_LONG_TABLE_PARTITION_COMMENT,
subpart_elem->partition_name))
DBUG_RETURN(NULL);
subpart_elem->part_comment[comment.length]= '\0';
}
}
}
}
if (create_info->tmp_table())
{
my_error(ER_PARTITION_NO_TEMPORARY, MYF(0));
goto err;
}
if ((part_engine_type == partition_hton) &&
part_info->default_engine_type)
{
/*
This only happens at ALTER TABLE.
default_engine_type was assigned from the engine set in the ALTER
TABLE command.
*/
;
}
else
{
if (create_info->used_fields & HA_CREATE_USED_ENGINE)
{
part_info->default_engine_type= create_info->db_type;
}
else
{
if (part_info->default_engine_type == NULL)
{
part_info->default_engine_type= ha_default_handlerton(thd);
}
}
}
DBUG_PRINT("info", ("db_type = %s create_info->db_type = %s",
ha_resolve_storage_engine_name(part_info->default_engine_type),
ha_resolve_storage_engine_name(create_info->db_type)));
if (part_info->check_partition_info(thd, &engine_type, file,
create_info, FALSE))
goto err;
part_info->default_engine_type= engine_type;
/*
We reverse the partitioning parser and generate a standard format
for syntax stored in frm file.
*/
if (!(part_syntax_buf= generate_partition_syntax(part_info,
&syntax_len,
TRUE, TRUE,
create_info,
alter_info,
NULL)))
goto err;
part_info->part_info_string= part_syntax_buf;
part_info->part_info_len= syntax_len;
if ((!(engine_type->partition_flags &&
engine_type->partition_flags() & HA_CAN_PARTITION)) ||
create_info->db_type == partition_hton)
{
/*
The handler assigned to the table cannot handle partitioning.
Assign the partition handler as the handler of the table.
*/
DBUG_PRINT("info", ("db_type: %s",
ha_resolve_storage_engine_name(create_info->db_type)));
delete file;
create_info->db_type= partition_hton;
if (!(file= get_ha_partition(part_info)))
DBUG_RETURN(NULL);
/*
If we have default number of partitions or subpartitions we
might require to set-up the part_info object such that it
creates a proper .par file. The current part_info object is
only used to create the frm-file and .par-file.
*/
if (part_info->use_default_num_partitions &&
part_info->num_parts &&
(int)part_info->num_parts !=
file->get_default_no_partitions(create_info))
{
uint i;
List_iterator<partition_element> part_it(part_info->partitions);
part_it++;
DBUG_ASSERT(thd->lex->sql_command != SQLCOM_CREATE_TABLE);
for (i= 1; i < part_info->partitions.elements; i++)
(part_it++)->part_state= PART_TO_BE_DROPPED;
}
else if (part_info->is_sub_partitioned() &&
part_info->use_default_num_subpartitions &&
part_info->num_subparts &&
(int)part_info->num_subparts !=
file->get_default_no_partitions(create_info))
{
DBUG_ASSERT(thd->lex->sql_command != SQLCOM_CREATE_TABLE);
part_info->num_subparts= file->get_default_no_partitions(create_info);
}
}
else if (create_info->db_type != engine_type)
{
/*
We come here when we don't use a partitioned handler.
Since we use a partitioned table it must be "native partitioned".
We have switched engine from defaults, most likely only specified
engines in partition clauses.
*/
delete file;
if (!(file= get_new_handler((TABLE_SHARE*) 0, thd->mem_root,
engine_type)))
{
mem_alloc_error(sizeof(handler));
DBUG_RETURN(NULL);
}
}
}
/*
Unless table's storage engine supports partitioning natively
don't allow foreign keys on partitioned tables (they won't
work work even with InnoDB beneath of partitioning engine).
If storage engine handles partitioning natively (like NDB)
foreign keys support is possible, so we let the engine decide.
*/
if (create_info->db_type == partition_hton)
{
List_iterator_fast<Key> key_iterator(alter_info->key_list);
Key *key;
while ((key= key_iterator++))
{
if (key->type == Key::FOREIGN_KEY)
{
my_error(ER_FOREIGN_KEY_ON_PARTITIONED, MYF(0));
goto err;
}
}
}
#endif
if (mysql_prepare_create_table(thd, create_info, alter_info, &db_options,
file, key_info, key_count,
create_table_mode))
goto err;
create_info->table_options=db_options;
*frm= build_frm_image(thd, table_name, create_info,
alter_info->create_list, *key_count,
*key_info, file);
if (frm->str)
DBUG_RETURN(file);
err:
delete file;
DBUG_RETURN(NULL);
}
/**
Create a table
@param thd Thread object
@param orig_db Database for error messages
@param orig_table_name Table name for error messages
(it's different from table_name for ALTER TABLE)
@param db Database
@param table_name Table name
@param path Path to table (i.e. to its .FRM file without
the extension).
@param create_info Create information (like MAX_ROWS)
@param alter_info Description of fields and keys for new table
@param create_table_mode C_ORDINARY_CREATE, C_ALTER_TABLE, C_ASSISTED_DISCOVERY
or any positive number (for C_CREATE_SELECT).
@param[out] is_trans Identifies the type of engine where the table
was created: either trans or non-trans.
@param[out] key_info Array of KEY objects describing keys in table
which was created.
@param[out] key_count Number of keys in table which was created.
If one creates a temporary table, this is automatically opened
Note that this function assumes that caller already have taken
exclusive metadata lock on table being created or used some other
way to ensure that concurrent operations won't intervene.
mysql_create_table() is a wrapper that can be used for this.
@retval 0 OK
@retval 1 error
@retval -1 table existed but IF EXISTS was used
*/
static
int create_table_impl(THD *thd,
const char *orig_db, const char *orig_table_name,
const char *db, const char *table_name,
const char *path,
const DDL_options_st options,
HA_CREATE_INFO *create_info,
Alter_info *alter_info,
int create_table_mode,
bool *is_trans,
KEY **key_info,
uint *key_count,
LEX_CUSTRING *frm)
{
const char *alias;
handler *file= 0;
int error= 1;
bool frm_only= create_table_mode == C_ALTER_TABLE_FRM_ONLY;
bool internal_tmp_table= create_table_mode == C_ALTER_TABLE || frm_only;
DBUG_ENTER("mysql_create_table_no_lock");
DBUG_PRINT("enter", ("db: '%s' table: '%s' tmp: %d",
db, table_name, internal_tmp_table));
if (thd->variables.sql_mode & MODE_NO_DIR_IN_CREATE)
{
if (create_info->data_file_name)
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
WARN_OPTION_IGNORED, ER(WARN_OPTION_IGNORED),
"DATA DIRECTORY");
if (create_info->index_file_name)
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN,
WARN_OPTION_IGNORED, ER(WARN_OPTION_IGNORED),
"INDEX DIRECTORY");
create_info->data_file_name= create_info->index_file_name= 0;
}
else
if (error_if_data_home_dir(create_info->data_file_name, "DATA DIRECTORY") ||
error_if_data_home_dir(create_info->index_file_name, "INDEX DIRECTORY")||
check_partition_dirs(thd->lex->part_info))
goto err;
alias= table_case_name(create_info, table_name);
/* Check if table exists */
if (create_info->tmp_table())
{
TABLE *tmp_table;
if ((tmp_table= find_temporary_table(thd, db, table_name)))
{
bool table_creation_was_logged= tmp_table->s->table_creation_was_logged;
if (options.or_replace())
{
bool is_trans;
/*
We are using CREATE OR REPLACE on an existing temporary table
Remove the old table so that we can re-create it.
*/
if (drop_temporary_table(thd, tmp_table, &is_trans))
goto err;
}
else if (options.if_not_exists())
goto warn;
else
{
my_error(ER_TABLE_EXISTS_ERROR, MYF(0), alias);
goto err;
}
/*
We have to log this query, even if it failed later to ensure the
drop is done.
*/
#ifndef DONT_LOG_DROP_OF_TEMPORARY_TABLES
table_creation_was_logged= 1;
#endif
if (table_creation_was_logged)
{
thd->variables.option_bits|= OPTION_KEEP_LOG;
thd->log_current_statement= 1;
create_info->table_was_deleted= 1;
}
}
}
else
{
if (!internal_tmp_table && ha_table_exists(thd, db, table_name))
{
if (options.or_replace())
{
TABLE_LIST table_list;
table_list.init_one_table(db, strlen(db), table_name,
strlen(table_name), table_name,
TL_WRITE_ALLOW_WRITE);
table_list.table= create_info->table;
if (check_if_log_table(&table_list, TRUE, "CREATE OR REPLACE"))
goto err;
/*
Rollback the empty transaction started in mysql_create_table()
call to open_and_lock_tables() when we are using LOCK TABLES.
*/
(void) trans_rollback_stmt(thd);
/* Remove normal table without logging. Keep tables locked */
if (mysql_rm_table_no_locks(thd, &table_list, 0, 0, 0, 1, 1))
goto err;
/*
We have to log this query, even if it failed later to ensure the
drop is done.
*/
thd->variables.option_bits|= OPTION_KEEP_LOG;
thd->log_current_statement= 1;
create_info->table_was_deleted= 1;
DBUG_EXECUTE_IF("send_kill_after_delete", thd->killed= KILL_QUERY; );
/*
Restart statement transactions for the case of CREATE ... SELECT.
*/
if (thd->lex->select_lex.item_list.elements &&
restart_trans_for_tables(thd, thd->lex->query_tables))
goto err;
}
else if (options.if_not_exists())
goto warn;
else
{
my_error(ER_TABLE_EXISTS_ERROR, MYF(0), table_name);
goto err;
}
}
}
THD_STAGE_INFO(thd, stage_creating_table);
if (check_engine(thd, orig_db, orig_table_name, create_info))
goto err;
if (create_table_mode == C_ASSISTED_DISCOVERY)
{
/* check that it's used correctly */
DBUG_ASSERT(alter_info->create_list.elements == 0);
DBUG_ASSERT(alter_info->key_list.elements == 0);
TABLE_SHARE share;
handlerton *hton= create_info->db_type;
int ha_err;
Field *no_fields= 0;
if (!hton->discover_table_structure)
{
my_error(ER_TABLE_MUST_HAVE_COLUMNS, MYF(0));
goto err;
}
init_tmp_table_share(thd, &share, db, 0, table_name, path);
/* prepare everything for discovery */
share.field= &no_fields;
share.db_plugin= ha_lock_engine(thd, hton);
share.option_list= create_info->option_list;
share.connect_string= create_info->connect_string;
if (parse_engine_table_options(thd, hton, &share))
goto err;
ha_err= hton->discover_table_structure(hton, thd, &share, create_info);
/*
if discovery failed, the plugin will be auto-unlocked, as it
was locked on the THD, see above.
if discovery succeeded, the plugin was replaced by a globally
locked plugin, that will be unlocked by free_table_share()
*/
if (ha_err)
share.db_plugin= 0; // will be auto-freed, locked above on the THD
free_table_share(&share);
if (ha_err)
{
my_error(ER_GET_ERRNO, MYF(0), ha_err, hton_name(hton)->str);
goto err;
}
}
else
{
file= mysql_create_frm_image(thd, orig_db, orig_table_name, create_info,
alter_info, create_table_mode, key_info,
key_count, frm);
if (!file)
goto err;
if (rea_create_table(thd, frm, path, db, table_name, create_info,
file, frm_only))
goto err;
}
create_info->table= 0;
if (!frm_only && create_info->tmp_table())
{
/*
Open a table (skipping table cache) and add it into
THD::temporary_tables list.
*/
TABLE *table= open_table_uncached(thd, create_info->db_type, frm, path,
db, table_name, true, true);
if (!table)
{
(void) rm_temporary_table(create_info->db_type, path);
goto err;
}
if (is_trans != NULL)
*is_trans= table->file->has_transactions();
thd->thread_specific_used= TRUE;
create_info->table= table; // Store pointer to table
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
else if (thd->work_part_info && frm_only)
{
/*
For partitioned tables we can't find some problems with table
until table is opened. Therefore in order to disallow creation
of corrupted tables we have to try to open table as the part
of its creation process.
In cases when both .FRM and SE part of table are created table
is implicitly open in ha_create_table() call.
In cases when we create .FRM without SE part we have to open
table explicitly.
*/
TABLE table;
TABLE_SHARE share;
init_tmp_table_share(thd, &share, db, 0, table_name, path);
bool result= (open_table_def(thd, &share, GTS_TABLE) ||
open_table_from_share(thd, &share, "", 0, (uint) READ_ALL,
0, &table, true));
if (!result)
(void) closefrm(&table, 0);
free_table_share(&share);
if (result)
{
char frm_name[FN_REFLEN];
strxnmov(frm_name, sizeof(frm_name), path, reg_ext, NullS);
(void) mysql_file_delete(key_file_frm, frm_name, MYF(0));
(void) file->ha_create_partitioning_metadata(path, NULL, CHF_DELETE_FLAG);
goto err;
}
}
#endif
error= 0;
err:
THD_STAGE_INFO(thd, stage_after_create);
delete file;
DBUG_PRINT("exit", ("return: %d", error));
DBUG_RETURN(error);
warn:
error= -1;
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_TABLE_EXISTS_ERROR, ER(ER_TABLE_EXISTS_ERROR),
alias);
goto err;
}
/**
Simple wrapper around create_table_impl() to be used
in various version of CREATE TABLE statement.
*/
int mysql_create_table_no_lock(THD *thd,
const char *db, const char *table_name,
Table_specification_st *create_info,
Alter_info *alter_info, bool *is_trans,
int create_table_mode)
{
KEY *not_used_1;
uint not_used_2;
int res;
char path[FN_REFLEN + 1];
LEX_CUSTRING frm= {0,0};
if (create_info->tmp_table())
build_tmptable_filename(thd, path, sizeof(path));
else
{
int length;
const char *alias= table_case_name(create_info, table_name);
length= build_table_filename(path, sizeof(path) - 1, db, alias,
"", 0);
// Check if we hit FN_REFLEN bytes along with file extension.
if (length+reg_ext_length > FN_REFLEN)
{
my_error(ER_IDENT_CAUSES_TOO_LONG_PATH, MYF(0), sizeof(path)-1, path);
return true;
}
}
res= create_table_impl(thd, db, table_name, db, table_name, path,
*create_info, create_info,
alter_info, create_table_mode,
is_trans, &not_used_1, &not_used_2, &frm);
my_free(const_cast<uchar*>(frm.str));
return res;
}
/**
Implementation of SQLCOM_CREATE_TABLE.
Take the metadata locks (including a shared lock on the affected
schema) and create the table. Is written to be called from
mysql_execute_command(), to which it delegates the common parts
with other commands (i.e. implicit commit before and after,
close of thread tables.
*/
bool mysql_create_table(THD *thd, TABLE_LIST *create_table,
Table_specification_st *create_info,
Alter_info *alter_info)
{
const char *db= create_table->db;
const char *table_name= create_table->table_name;
bool is_trans= FALSE;
bool result;
int create_table_mode;
TABLE_LIST *pos_in_locked_tables= 0;
MDL_ticket *mdl_ticket= 0;
DBUG_ENTER("mysql_create_table");
DBUG_ASSERT(create_table == thd->lex->query_tables);
/* Copy temporarily the statement flags to thd for lock_table_names() */
uint save_thd_create_info_options= thd->lex->create_info.options;
thd->lex->create_info.options|= create_info->options;
/* Open or obtain an exclusive metadata lock on table being created */
result= open_and_lock_tables(thd, *create_info, create_table, FALSE, 0);
thd->lex->create_info.options= save_thd_create_info_options;
if (result)
{
/* is_error() may be 0 if table existed and we generated a warning */
DBUG_RETURN(thd->is_error());
}
/* The following is needed only in case of lock tables */
if ((create_info->table= create_table->table))
{
pos_in_locked_tables= create_info->table->pos_in_locked_tables;
mdl_ticket= create_table->table->mdl_ticket;
}
/* Got lock. */
DEBUG_SYNC(thd, "locked_table_name");
if (alter_info->create_list.elements || alter_info->key_list.elements)
create_table_mode= C_ORDINARY_CREATE;
else
create_table_mode= C_ASSISTED_DISCOVERY;
promote_first_timestamp_column(&alter_info->create_list);
if (mysql_create_table_no_lock(thd, db, table_name, create_info, alter_info,
&is_trans, create_table_mode) > 0)
{
result= 1;
goto err;
}
/*
Check if we are doing CREATE OR REPLACE TABLE under LOCK TABLES
on a non temporary table
*/
if (thd->locked_tables_mode && pos_in_locked_tables &&
create_info->or_replace())
{
/*
Add back the deleted table and re-created table as a locked table
This should always work as we have a meta lock on the table.
*/
thd->locked_tables_list.add_back_last_deleted_lock(pos_in_locked_tables);
if (thd->locked_tables_list.reopen_tables(thd))
{
thd->locked_tables_list.unlink_all_closed_tables(thd, NULL, 0);
result= 1;
}
else
{
TABLE *table= pos_in_locked_tables->table;
table->mdl_ticket->downgrade_lock(MDL_SHARED_NO_READ_WRITE);
}
}
err:
/* In RBR we don't need to log CREATE TEMPORARY TABLE */
if (thd->is_current_stmt_binlog_format_row() && create_info->tmp_table())
DBUG_RETURN(result);
/* Write log if no error or if we already deleted a table */
if (!result || thd->log_current_statement)
{
if (result && create_info->table_was_deleted)
{
/*
Possible locked table was dropped. We should remove meta data locks
associated with it and do UNLOCK_TABLES if no more locked tables.
*/
thd->locked_tables_list.unlock_locked_table(thd, mdl_ticket);
}
else if (!result && create_info->tmp_table() && create_info->table)
{
/*
Remember that tmp table creation was logged so that we know if
we should log a delete of it.
*/
create_info->table->s->table_creation_was_logged= 1;
}
if (write_bin_log(thd, result ? FALSE : TRUE, thd->query(),
thd->query_length(), is_trans))
result= 1;
}
DBUG_RETURN(result);
}
/*
** Give the key name after the first field with an optional '_#' after
**/
static bool
check_if_keyname_exists(const char *name, KEY *start, KEY *end)
{
for (KEY *key=start ; key != end ; key++)
if (!my_strcasecmp(system_charset_info,name,key->name))
return 1;
return 0;
}
static char *
make_unique_key_name(const char *field_name,KEY *start,KEY *end)
{
char buff[MAX_FIELD_NAME],*buff_end;
if (!check_if_keyname_exists(field_name,start,end) &&
my_strcasecmp(system_charset_info,field_name,primary_key_name))
return (char*) field_name; // Use fieldname
buff_end=strmake(buff,field_name, sizeof(buff)-4);
/*
Only 3 chars + '\0' left, so need to limit to 2 digit
This is ok as we can't have more than 100 keys anyway
*/
for (uint i=2 ; i< 100; i++)
{
*buff_end= '_';
int10_to_str(i, buff_end+1, 10);
if (!check_if_keyname_exists(buff,start,end))
return sql_strdup(buff);
}
return (char*) "not_specified"; // Should never happen
}
/****************************************************************************
** Alter a table definition
****************************************************************************/
/**
Rename a table.
@param base The handlerton handle.
@param old_db The old database name.
@param old_name The old table name.
@param new_db The new database name.
@param new_name The new table name.
@param flags flags
FN_FROM_IS_TMP old_name is temporary.
FN_TO_IS_TMP new_name is temporary.
NO_FRM_RENAME Don't rename the FRM file
but only the table in the storage engine.
NO_HA_TABLE Don't rename table in engine.
NO_FK_CHECKS Don't check FK constraints during rename.
@return false OK
@return true Error
*/
bool
mysql_rename_table(handlerton *base, const char *old_db,
const char *old_name, const char *new_db,
const char *new_name, uint flags)
{
THD *thd= current_thd;
char from[FN_REFLEN + 1], to[FN_REFLEN + 1],
lc_from[FN_REFLEN + 1], lc_to[FN_REFLEN + 1];
char *from_base= from, *to_base= to;
char tmp_name[SAFE_NAME_LEN+1], tmp_db_name[SAFE_NAME_LEN+1];
handler *file;
int error=0;
ulonglong save_bits= thd->variables.option_bits;
int length;
DBUG_ENTER("mysql_rename_table");
DBUG_PRINT("enter", ("old: '%s'.'%s' new: '%s'.'%s'",
old_db, old_name, new_db, new_name));
// Temporarily disable foreign key checks
if (flags & NO_FK_CHECKS)
thd->variables.option_bits|= OPTION_NO_FOREIGN_KEY_CHECKS;
file= (base == NULL ? 0 :
get_new_handler((TABLE_SHARE*) 0, thd->mem_root, base));
build_table_filename(from, sizeof(from) - 1, old_db, old_name, "",
flags & FN_FROM_IS_TMP);
length= build_table_filename(to, sizeof(to) - 1, new_db, new_name, "",
flags & FN_TO_IS_TMP);
// Check if we hit FN_REFLEN bytes along with file extension.
if (length+reg_ext_length > FN_REFLEN)
{
my_error(ER_IDENT_CAUSES_TOO_LONG_PATH, MYF(0), sizeof(to)-1, to);
DBUG_RETURN(TRUE);
}
/*
If lower_case_table_names == 2 (case-preserving but case-insensitive
file system) and the storage is not HA_FILE_BASED, we need to provide
a lowercase file name, but we leave the .frm in mixed case.
*/
if (lower_case_table_names == 2 && file &&
!(file->ha_table_flags() & HA_FILE_BASED))
{
strmov(tmp_name, old_name);
my_casedn_str(files_charset_info, tmp_name);
strmov(tmp_db_name, old_db);
my_casedn_str(files_charset_info, tmp_db_name);
build_table_filename(lc_from, sizeof(lc_from) - 1, tmp_db_name, tmp_name,
"", flags & FN_FROM_IS_TMP);
from_base= lc_from;
strmov(tmp_name, new_name);
my_casedn_str(files_charset_info, tmp_name);
strmov(tmp_db_name, new_db);
my_casedn_str(files_charset_info, tmp_db_name);
build_table_filename(lc_to, sizeof(lc_to) - 1, tmp_db_name, tmp_name, "",
flags & FN_TO_IS_TMP);
to_base= lc_to;
}
if (flags & NO_HA_TABLE)
{
if (rename_file_ext(from,to,reg_ext))
error= my_errno;
(void) file->ha_create_partitioning_metadata(to, from, CHF_RENAME_FLAG);
}
else if (!file || !(error=file->ha_rename_table(from_base, to_base)))
{
if (!(flags & NO_FRM_RENAME) && rename_file_ext(from,to,reg_ext))
{
error=my_errno;
if (file)
{
if (error == ENOENT)
error= 0; // this is ok if file->ha_rename_table() succeeded
else
file->ha_rename_table(to_base, from_base); // Restore old file name
}
}
}
delete file;
if (error == HA_ERR_WRONG_COMMAND)
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "ALTER TABLE");
else if (error)
my_error(ER_ERROR_ON_RENAME, MYF(0), from, to, error);
else if (!(flags & FN_IS_TMP))
mysql_audit_rename_table(thd, old_db, old_name, new_db, new_name);
/*
Remove the old table share from the pfs table share array. The new table
share will be created when the renamed table is first accessed.
*/
if (likely(error == 0))
{
PSI_CALL_drop_table_share(flags & FN_FROM_IS_TMP,
old_db, strlen(old_db),
old_name, strlen(old_name));
}
// Restore options bits to the original value
thd->variables.option_bits= save_bits;
DBUG_RETURN(error != 0);
}
/*
Create a table identical to the specified table
SYNOPSIS
mysql_create_like_table()
thd Thread object
table Table list element for target table
src_table Table list element for source table
create_info Create info
RETURN VALUES
FALSE OK
TRUE error
*/
bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
TABLE_LIST* src_table,
Table_specification_st *create_info)
{
Table_specification_st local_create_info;
TABLE_LIST *pos_in_locked_tables= 0;
Alter_info local_alter_info;
Alter_table_ctx local_alter_ctx; // Not used
bool res= TRUE;
bool is_trans= FALSE;
bool do_logging= FALSE;
uint not_used;
int create_res;
DBUG_ENTER("mysql_create_like_table");
#ifdef WITH_WSREP
if (WSREP_ON && !thd->wsrep_applier &&
wsrep_create_like_table(thd, table, src_table, create_info))
DBUG_RETURN(res);
#endif
/*
We the open source table to get its description in HA_CREATE_INFO
and Alter_info objects. This also acquires a shared metadata lock
on this table which ensures that no concurrent DDL operation will
mess with it.
Also in case when we create non-temporary table open_tables()
call obtains an exclusive metadata lock on target table ensuring
that we can safely perform table creation.
Thus by holding both these locks we ensure that our statement is
properly isolated from all concurrent operations which matter.
*/
/* Copy temporarily the statement flags to thd for lock_table_names() */
// QQ: is this really needed???
uint save_thd_create_info_options= thd->lex->create_info.options;
thd->lex->create_info.options|= create_info->options;
res= open_tables(thd, &thd->lex->query_tables, &not_used, 0);
thd->lex->create_info.options= save_thd_create_info_options;
if (res)
{
/* is_error() may be 0 if table existed and we generated a warning */
res= thd->is_error();
goto err;
}
/* Ensure we don't try to create something from which we select from */
if (create_info->or_replace() && !create_info->tmp_table())
{
TABLE_LIST *duplicate;
if ((duplicate= unique_table(thd, table, src_table, 0)))
{
update_non_unique_table_error(src_table, "CREATE", duplicate);
goto err;
}
}
src_table->table->use_all_columns();
DEBUG_SYNC(thd, "create_table_like_after_open");
/*
Fill Table_specification_st and Alter_info with the source table description.
Set OR REPLACE and IF NOT EXISTS option as in the CREATE TABLE LIKE
statement.
*/
local_create_info.init(create_info->create_like_options());
local_create_info.db_type= src_table->table->s->db_type();
local_create_info.row_type= src_table->table->s->row_type;
if (mysql_prepare_alter_table(thd, src_table->table, &local_create_info,
&local_alter_info, &local_alter_ctx))
goto err;
#ifdef WITH_PARTITION_STORAGE_ENGINE
/* Partition info is not handled by mysql_prepare_alter_table() call. */
if (src_table->table->part_info)
thd->work_part_info= src_table->table->part_info->get_clone();
#endif
/*
Adjust description of source table before using it for creation of
target table.
Similarly to SHOW CREATE TABLE we ignore MAX_ROWS attribute of
temporary table which represents I_S table.
*/
if (src_table->schema_table)
local_create_info.max_rows= 0;
/* Replace type of source table with one specified in the statement. */
local_create_info.options&= ~HA_LEX_CREATE_TMP_TABLE;
local_create_info.options|= create_info->tmp_table();
/* Reset auto-increment counter for the new table. */
local_create_info.auto_increment_value= 0;
/*
Do not inherit values of DATA and INDEX DIRECTORY options from
the original table. This is documented behavior.
*/
local_create_info.data_file_name= local_create_info.index_file_name= NULL;
/* The following is needed only in case of lock tables */
if ((local_create_info.table= thd->lex->query_tables->table))
pos_in_locked_tables= local_create_info.table->pos_in_locked_tables;
res= ((create_res=
mysql_create_table_no_lock(thd, table->db, table->table_name,
&local_create_info, &local_alter_info,
&is_trans, C_ORDINARY_CREATE)) > 0);
/* Remember to log if we deleted something */
do_logging= thd->log_current_statement;
if (res)
goto err;
/*
Check if we are doing CREATE OR REPLACE TABLE under LOCK TABLES
on a non temporary table
*/
if (thd->locked_tables_mode && pos_in_locked_tables &&
create_info->or_replace())
{
/*
Add back the deleted table and re-created table as a locked table
This should always work as we have a meta lock on the table.
*/
thd->locked_tables_list.add_back_last_deleted_lock(pos_in_locked_tables);
if (thd->locked_tables_list.reopen_tables(thd))
{
thd->locked_tables_list.unlink_all_closed_tables(thd, NULL, 0);
res= 1; // We got an error
}
else
{
/*
Get pointer to the newly opened table. We need this to ensure we
don't reopen the table when doing statment logging below.
*/
table->table= pos_in_locked_tables->table;
table->table->mdl_ticket->downgrade_lock(MDL_SHARED_NO_READ_WRITE);
}
}
else
{
/*
Ensure that we have an exclusive lock on target table if we are creating
non-temporary table.
*/
DBUG_ASSERT((create_info->tmp_table()) ||
thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db,
table->table_name,
MDL_EXCLUSIVE));
}
DEBUG_SYNC(thd, "create_table_like_before_binlog");
/*
We have to write the query before we unlock the tables.
*/
if (thd->is_current_stmt_binlog_format_row())
{
/*
Since temporary tables are not replicated under row-based
replication, CREATE TABLE ... LIKE ... needs special
treatement. We have four cases to consider, according to the
following decision table:
==== ========= ========= ==============================
Case Target Source Write to binary log
==== ========= ========= ==============================
1 normal normal Original statement
2 normal temporary Generated statement if the table
was created.
3 temporary normal Nothing
4 temporary temporary Nothing
==== ========= ========= ==============================
*/
if (!(create_info->tmp_table()))
{
if (src_table->table->s->tmp_table) // Case 2
{
char buf[2048];
String query(buf, sizeof(buf), system_charset_info);
query.length(0); // Have to zero it since constructor doesn't
Open_table_context ot_ctx(thd, MYSQL_OPEN_REOPEN |
MYSQL_OPEN_IGNORE_KILLED);
bool new_table= FALSE; // Whether newly created table is open.
if (create_res != 0)
{
/*
Table or view with same name already existed and we where using
IF EXISTS. Continue without logging anything.
*/
do_logging= 0;
goto err;
}
if (!table->table)
{
TABLE_LIST::enum_open_strategy save_open_strategy;
int open_res;
/* Force the newly created table to be opened */
save_open_strategy= table->open_strategy;
table->open_strategy= TABLE_LIST::OPEN_NORMAL;
/*
In order for show_create_table() to work we need to open
destination table if it is not already open (i.e. if it
has not existed before). We don't need acquire metadata
lock in order to do this as we already hold exclusive
lock on this table. The table will be closed by
close_thread_table() at the end of this branch.
*/
open_res= open_table(thd, table, &ot_ctx);
/* Restore */
table->open_strategy= save_open_strategy;
if (open_res)
{
res= 1;
goto err;
}
new_table= TRUE;
}
/*
We have to re-test if the table was a view as the view may not
have been opened until just above.
*/
if (!table->view)
{
int result __attribute__((unused))=
show_create_table(thd, table, &query,
create_info, WITHOUT_DB_NAME);
DBUG_ASSERT(result == 0); // show_create_table() always return 0
do_logging= FALSE;
if (write_bin_log(thd, TRUE, query.ptr(), query.length()))
{
res= 1;
do_logging= 0;
goto err;
}
if (new_table)
{
DBUG_ASSERT(thd->open_tables == table->table);
/*
When opening the table, we ignored the locked tables
(MYSQL_OPEN_GET_NEW_TABLE). Now we can close the table
without risking to close some locked table.
*/
close_thread_table(thd, &thd->open_tables);
}
}
}
else // Case 1
do_logging= TRUE;
}
/*
Case 3 and 4 does nothing under RBR
*/
}
else
{
DBUG_PRINT("info",
("res: %d tmp_table: %d create_info->table: %p",
res, create_info->tmp_table(), local_create_info.table));
if (!res && create_info->tmp_table() && local_create_info.table)
{
/*
Remember that tmp table creation was logged so that we know if
we should log a delete of it.
*/
local_create_info.table->s->table_creation_was_logged= 1;
}
do_logging= TRUE;
}
err:
if (do_logging)
{
if (res && create_info->table_was_deleted)
{
/*
Table was not deleted. Original table was deleted.
We have to log it.
*/
log_drop_table(thd, table->db, table->db_length,
table->table_name, table->table_name_length,
create_info->tmp_table());
}
else if (write_bin_log(thd, res ? FALSE : TRUE, thd->query(),
thd->query_length(), is_trans))
res= 1;
}
DBUG_RETURN(res);
}
/* table_list should contain just one table */
int mysql_discard_or_import_tablespace(THD *thd,
TABLE_LIST *table_list,
bool discard)
{
Alter_table_prelocking_strategy alter_prelocking_strategy;
int error;
DBUG_ENTER("mysql_discard_or_import_tablespace");
mysql_audit_alter_table(thd, table_list);
/*
Note that DISCARD/IMPORT TABLESPACE always is the only operation in an
ALTER TABLE
*/
THD_STAGE_INFO(thd, stage_discard_or_import_tablespace);
/*
We set this flag so that ha_innobase::open and ::external_lock() do
not complain when we lock the table
*/
thd->tablespace_op= TRUE;
/*
Adjust values of table-level and metadata which was set in parser
for the case general ALTER TABLE.
*/
table_list->mdl_request.set_type(MDL_EXCLUSIVE);
table_list->lock_type= TL_WRITE;
/* Do not open views. */
table_list->required_type= FRMTYPE_TABLE;
if (open_and_lock_tables(thd, table_list, FALSE, 0,
&alter_prelocking_strategy))
{
thd->tablespace_op=FALSE;
DBUG_RETURN(-1);
}
error= table_list->table->file->ha_discard_or_import_tablespace(discard);
THD_STAGE_INFO(thd, stage_end);
if (error)
goto err;
/*
The 0 in the call below means 'not in a transaction', which means
immediate invalidation; that is probably what we wish here
*/
query_cache_invalidate3(thd, table_list, 0);
/* The ALTER TABLE is always in its own transaction */
error= trans_commit_stmt(thd);
if (trans_commit_implicit(thd))
error=1;
if (error)
goto err;
error= write_bin_log(thd, FALSE, thd->query(), thd->query_length());
err:
thd->tablespace_op=FALSE;
if (error == 0)
{
my_ok(thd);
DBUG_RETURN(0);
}
table_list->table->file->print_error(error, MYF(0));
DBUG_RETURN(-1);
}
/**
Check if key is a candidate key, i.e. a unique index with no index
fields partial or nullable.
*/
static bool is_candidate_key(KEY *key)
{
KEY_PART_INFO *key_part;
KEY_PART_INFO *key_part_end= key->key_part + key->user_defined_key_parts;
if (!(key->flags & HA_NOSAME) || (key->flags & HA_NULL_PART_KEY))
return false;
for (key_part= key->key_part; key_part < key_part_end; key_part++)
{
if (key_part->key_part_flag & HA_PART_KEY_SEG)
return false;
}
return true;
}
/*
Preparation for table creation
SYNOPSIS
handle_if_exists_option()
thd Thread object.
table The altered table.
alter_info List of columns and indexes to create
DESCRIPTION
Looks for the IF [NOT] EXISTS options, checks the states and remove items
from the list if existing found.
RETURN VALUES
NONE
*/
static void
handle_if_exists_options(THD *thd, TABLE *table, Alter_info *alter_info)
{
Field **f_ptr;
DBUG_ENTER("handle_if_exists_option");
/* Handle ADD COLUMN IF NOT EXISTS. */
{
List_iterator<Create_field> it(alter_info->create_list);
Create_field *sql_field;
while ((sql_field=it++))
{
if (!sql_field->create_if_not_exists || sql_field->change)
continue;
/*
If there is a field with the same name in the table already,
remove the sql_field from the list.
*/
for (f_ptr=table->field; *f_ptr; f_ptr++)
{
if (my_strcasecmp(system_charset_info,
sql_field->field_name, (*f_ptr)->field_name) == 0)
goto drop_create_field;
}
{
/*
If in the ADD list there is a field with the same name,
remove the sql_field from the list.
*/
List_iterator<Create_field> chk_it(alter_info->create_list);
Create_field *chk_field;
while ((chk_field= chk_it++) && chk_field != sql_field)
{
if (my_strcasecmp(system_charset_info,
sql_field->field_name, chk_field->field_name) == 0)
goto drop_create_field;
}
}
continue;
drop_create_field:
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_DUP_FIELDNAME, ER(ER_DUP_FIELDNAME),
sql_field->field_name);
it.remove();
if (alter_info->create_list.is_empty())
{
alter_info->flags&= ~Alter_info::ALTER_ADD_COLUMN;
if (alter_info->key_list.is_empty())
alter_info->flags&= ~(Alter_info::ALTER_ADD_INDEX |
Alter_info::ADD_FOREIGN_KEY);
}
}
}
/* Handle MODIFY COLUMN IF EXISTS. */
{
List_iterator<Create_field> it(alter_info->create_list);
Create_field *sql_field;
while ((sql_field=it++))
{
if (!sql_field->create_if_not_exists || !sql_field->change)
continue;
/*
If there is NO field with the same name in the table already,
remove the sql_field from the list.
*/
for (f_ptr=table->field; *f_ptr; f_ptr++)
{
if (my_strcasecmp(system_charset_info,
sql_field->change, (*f_ptr)->field_name) == 0)
{
break;
}
}
if (*f_ptr == NULL)
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_BAD_FIELD_ERROR, ER(ER_BAD_FIELD_ERROR),
sql_field->change, table->s->table_name.str);
it.remove();
if (alter_info->create_list.is_empty())
{
alter_info->flags&= ~(Alter_info::ALTER_ADD_COLUMN |
Alter_info::ALTER_CHANGE_COLUMN);
if (alter_info->key_list.is_empty())
alter_info->flags&= ~Alter_info::ALTER_ADD_INDEX;
}
}
}
}
/* Handle DROP COLUMN/KEY IF EXISTS. */
{
List_iterator<Alter_drop> drop_it(alter_info->drop_list);
Alter_drop *drop;
bool remove_drop;
while ((drop= drop_it++))
{
if (!drop->drop_if_exists)
continue;
remove_drop= TRUE;
if (drop->type == Alter_drop::COLUMN)
{
/*
If there is NO field with that name in the table,
remove the 'drop' from the list.
*/
for (f_ptr=table->field; *f_ptr; f_ptr++)
{
if (my_strcasecmp(system_charset_info,
drop->name, (*f_ptr)->field_name) == 0)
{
remove_drop= FALSE;
break;
}
}
}
else /* Alter_drop::KEY */
{
uint n_key;
if (drop->type != Alter_drop::FOREIGN_KEY)
{
for (n_key=0; n_key < table->s->keys; n_key++)
{
if (my_strcasecmp(system_charset_info,
drop->name, table->key_info[n_key].name) == 0)
{
remove_drop= FALSE;
break;
}
}
}
else
{
List <FOREIGN_KEY_INFO> fk_child_key_list;
FOREIGN_KEY_INFO *f_key;
table->file->get_foreign_key_list(thd, &fk_child_key_list);
List_iterator<FOREIGN_KEY_INFO> fk_key_it(fk_child_key_list);
while ((f_key= fk_key_it++))
{
if (my_strcasecmp(system_charset_info, f_key->foreign_id->str,
drop->name) == 0)
{
remove_drop= FALSE;
break;
}
}
}
}
if (!remove_drop)
{
/*
Check if the name appears twice in the DROP list.
*/
List_iterator<Alter_drop> chk_it(alter_info->drop_list);
Alter_drop *chk_drop;
while ((chk_drop= chk_it++) && chk_drop != drop)
{
if (drop->type == chk_drop->type &&
my_strcasecmp(system_charset_info,
drop->name, chk_drop->name) == 0)
{
remove_drop= TRUE;
break;
}
}
}
if (remove_drop)
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_CANT_DROP_FIELD_OR_KEY, ER(ER_CANT_DROP_FIELD_OR_KEY),
drop->name);
drop_it.remove();
if (alter_info->drop_list.is_empty())
alter_info->flags&= ~(Alter_info::ALTER_DROP_COLUMN |
Alter_info::ALTER_DROP_INDEX |
Alter_info::DROP_FOREIGN_KEY);
}
}
}
/* ALTER TABLE ADD KEY IF NOT EXISTS */
/* ALTER TABLE ADD FOREIGN KEY IF NOT EXISTS */
{
Key *key;
List_iterator<Key> key_it(alter_info->key_list);
uint n_key;
const char *keyname;
while ((key=key_it++))
{
if (!key->if_not_exists() && !key->or_replace())
continue;
/* If the name of the key is not specified, */
/* let us check the name of the first key part. */
if ((keyname= key->name.str) == NULL)
{
List_iterator<Key_part_spec> part_it(key->columns);
Key_part_spec *kp;
if ((kp= part_it++))
keyname= kp->field_name.str;
if (keyname == NULL)
continue;
}
if (key->type != Key::FOREIGN_KEY)
{
for (n_key=0; n_key < table->s->keys; n_key++)
{
if (my_strcasecmp(system_charset_info,
keyname, table->key_info[n_key].name) == 0)
{
goto remove_key;
}
}
}
else
{
List <FOREIGN_KEY_INFO> fk_child_key_list;
FOREIGN_KEY_INFO *f_key;
table->file->get_foreign_key_list(thd, &fk_child_key_list);
List_iterator<FOREIGN_KEY_INFO> fk_key_it(fk_child_key_list);
while ((f_key= fk_key_it++))
{
if (my_strcasecmp(system_charset_info, f_key->foreign_id->str,
key->name.str) == 0)
goto remove_key;
}
}
{
Key *chk_key;
List_iterator<Key> chk_it(alter_info->key_list);
const char *chkname;
while ((chk_key=chk_it++) && chk_key != key)
{
if ((chkname= chk_key->name.str) == NULL)
{
List_iterator<Key_part_spec> part_it(chk_key->columns);
Key_part_spec *kp;
if ((kp= part_it++))
chkname= kp->field_name.str;
if (keyname == NULL)
continue;
}
if (key->type == chk_key->type &&
my_strcasecmp(system_charset_info, keyname, chkname) == 0)
goto remove_key;
}
}
continue;
remove_key:
if (key->if_not_exists())
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_DUP_KEYNAME, ER(ER_DUP_KEYNAME), keyname);
key_it.remove();
if (key->type == Key::FOREIGN_KEY)
{
/* ADD FOREIGN KEY appends two items. */
key_it.remove();
}
if (alter_info->key_list.is_empty())
alter_info->flags&= ~(Alter_info::ALTER_ADD_INDEX |
Alter_info::ADD_FOREIGN_KEY);
}
else if (key->or_replace())
{
Alter_drop::drop_type type= (key->type == Key::FOREIGN_KEY) ?
Alter_drop::FOREIGN_KEY : Alter_drop::KEY;
Alter_drop *ad= new Alter_drop(type, key->name.str, FALSE);
if (ad != NULL)
{
// Adding the index into the drop list for replacing
alter_info->flags |= Alter_info::ALTER_DROP_INDEX;
alter_info->drop_list.push_back(ad);
}
}
}
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
partition_info *tab_part_info= table->part_info;
if (tab_part_info)
{
/* ALTER TABLE ADD PARTITION IF NOT EXISTS */
if ((alter_info->flags & Alter_info::ALTER_ADD_PARTITION) &&
thd->lex->create_info.if_not_exists())
{
partition_info *alt_part_info= thd->lex->part_info;
if (alt_part_info)
{
List_iterator<partition_element> new_part_it(alt_part_info->partitions);
partition_element *pe;
while ((pe= new_part_it++))
{
if (!tab_part_info->has_unique_name(pe))
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_SAME_NAME_PARTITION, ER(ER_SAME_NAME_PARTITION),
pe->partition_name);
alter_info->flags&= ~Alter_info::ALTER_ADD_PARTITION;
thd->lex->part_info= NULL;
break;
}
}
}
}
/* ALTER TABLE DROP PARTITION IF EXISTS */
if ((alter_info->flags & Alter_info::ALTER_DROP_PARTITION) &&
thd->lex->if_exists())
{
List_iterator<char> names_it(alter_info->partition_names);
char *name;
while ((name= names_it++))
{
List_iterator<partition_element> part_it(tab_part_info->partitions);
partition_element *part_elem;
while ((part_elem= part_it++))
{
if (my_strcasecmp(system_charset_info,
part_elem->partition_name, name) == 0)
break;
}
if (!part_elem)
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_DROP_PARTITION_NON_EXISTENT,
ER(ER_DROP_PARTITION_NON_EXISTENT), "DROP");
names_it.remove();
}
}
if (alter_info->partition_names.elements == 0)
alter_info->flags&= ~Alter_info::ALTER_DROP_PARTITION;
}
}
#endif /*WITH_PARTITION_STORAGE_ENGINE*/
DBUG_VOID_RETURN;
}
/**
Get Create_field object for newly created table by field index.
@param alter_info Alter_info describing newly created table.
@param idx Field index.
*/
static Create_field *get_field_by_index(Alter_info *alter_info, uint idx)
{
List_iterator_fast<Create_field> field_it(alter_info->create_list);
uint field_idx= 0;
Create_field *field;
while ((field= field_it++) && field_idx < idx)
{ field_idx++; }
return field;
}
static int compare_uint(const uint *s, const uint *t)
{
return (*s < *t) ? -1 : ((*s > *t) ? 1 : 0);
}
/**
Compare original and new versions of a table and fill Alter_inplace_info
describing differences between those versions.
@param thd Thread
@param table The original table.
@param varchar Indicates that new definition has new
VARCHAR column.
@param[in/out] ha_alter_info Data structure which already contains
basic information about create options,
field and keys for the new version of
table and which should be completed with
more detailed information needed for
in-place ALTER.
First argument 'table' contains information of the original
table, which includes all corresponding parts that the new
table has in arguments create_list, key_list and create_info.
Compare the changes between the original and new table definitions.
The result of this comparison is then passed to SE which determines
whether it can carry out these changes in-place.
Mark any changes detected in the ha_alter_flags.
We generally try to specify handler flags only if there are real
changes. But in cases when it is cumbersome to determine if some
attribute has really changed we might choose to set flag
pessimistically, for example, relying on parser output only.
If there are no data changes, but index changes, 'index_drop_buffer'
and/or 'index_add_buffer' are populated with offsets into
table->key_info or key_info_buffer respectively for the indexes
that need to be dropped and/or (re-)created.
Note that this function assumes that it is OK to change Alter_info
and HA_CREATE_INFO which it gets. It is caller who is responsible
for creating copies for this structures if he needs them unchanged.
@retval true error
@retval false success
*/
static bool fill_alter_inplace_info(THD *thd,
TABLE *table,
bool varchar,
Alter_inplace_info *ha_alter_info)
{
Field **f_ptr, *field;
List_iterator_fast<Create_field> new_field_it;
Create_field *new_field;
KEY_PART_INFO *key_part, *new_part;
KEY_PART_INFO *end;
uint candidate_key_count= 0;
Alter_info *alter_info= ha_alter_info->alter_info;
DBUG_ENTER("fill_alter_inplace_info");
/* Allocate result buffers. */
if (! (ha_alter_info->index_drop_buffer=
(KEY**) thd->alloc(sizeof(KEY*) * table->s->keys)) ||
! (ha_alter_info->index_add_buffer=
(uint*) thd->alloc(sizeof(uint) *
alter_info->key_list.elements)))
DBUG_RETURN(true);
/* First we setup ha_alter_flags based on what was detected by parser. */
if (alter_info->flags & Alter_info::ALTER_ADD_COLUMN)
ha_alter_info->handler_flags|= Alter_inplace_info::ADD_COLUMN;
if (alter_info->flags & Alter_info::ALTER_DROP_COLUMN)
ha_alter_info->handler_flags|= Alter_inplace_info::DROP_COLUMN;
/*
Comparing new and old default values of column is cumbersome.
So instead of using such a comparison for detecting if default
has really changed we rely on flags set by parser to get an
approximate value for storage engine flag.
*/
if (alter_info->flags & (Alter_info::ALTER_CHANGE_COLUMN |
Alter_info::ALTER_CHANGE_COLUMN_DEFAULT))
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_DEFAULT;
if (alter_info->flags & Alter_info::ADD_FOREIGN_KEY)
ha_alter_info->handler_flags|= Alter_inplace_info::ADD_FOREIGN_KEY;
if (alter_info->flags & Alter_info::DROP_FOREIGN_KEY)
ha_alter_info->handler_flags|= Alter_inplace_info::DROP_FOREIGN_KEY;
if (alter_info->flags & Alter_info::ALTER_OPTIONS)
ha_alter_info->handler_flags|= Alter_inplace_info::CHANGE_CREATE_OPTION;
if (alter_info->flags & Alter_info::ALTER_RENAME)
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_RENAME;
/* Check partition changes */
if (alter_info->flags & Alter_info::ALTER_ADD_PARTITION)
ha_alter_info->handler_flags|= Alter_inplace_info::ADD_PARTITION;
if (alter_info->flags & Alter_info::ALTER_DROP_PARTITION)
ha_alter_info->handler_flags|= Alter_inplace_info::DROP_PARTITION;
if (alter_info->flags & Alter_info::ALTER_PARTITION)
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_PARTITION;
if (alter_info->flags & Alter_info::ALTER_COALESCE_PARTITION)
ha_alter_info->handler_flags|= Alter_inplace_info::COALESCE_PARTITION;
if (alter_info->flags & Alter_info::ALTER_REORGANIZE_PARTITION)
ha_alter_info->handler_flags|= Alter_inplace_info::REORGANIZE_PARTITION;
if (alter_info->flags & Alter_info::ALTER_TABLE_REORG)
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_TABLE_REORG;
if (alter_info->flags & Alter_info::ALTER_REMOVE_PARTITIONING)
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_REMOVE_PARTITIONING;
if (alter_info->flags & Alter_info::ALTER_ALL_PARTITION)
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_ALL_PARTITION;
/* Check for: ALTER TABLE FORCE, ALTER TABLE ENGINE and OPTIMIZE TABLE. */
if (alter_info->flags & Alter_info::ALTER_RECREATE)
ha_alter_info->handler_flags|= Alter_inplace_info::RECREATE_TABLE;
/*
If we altering table with old VARCHAR fields we will be automatically
upgrading VARCHAR column types.
*/
if (table->s->frm_version < FRM_VER_TRUE_VARCHAR && varchar)
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_TYPE;
/*
Go through fields in old version of table and detect changes to them.
We don't want to rely solely on Alter_info flags for this since:
a) new definition of column can be fully identical to the old one
despite the fact that this column is mentioned in MODIFY clause.
b) even if new column type differs from its old column from metadata
point of view, it might be identical from storage engine point
of view (e.g. when ENUM('a','b') is changed to ENUM('a','b',c')).
c) flags passed to storage engine contain more detailed information
about nature of changes than those provided from parser.
*/
for (f_ptr= table->field; (field= *f_ptr); f_ptr++)
{
/* Clear marker for renamed or dropped field
which we are going to set later. */
field->flags&= ~(FIELD_IS_RENAMED | FIELD_IS_DROPPED);
/* Use transformed info to evaluate flags for storage engine. */
uint new_field_index= 0;
new_field_it.init(alter_info->create_list);
while ((new_field= new_field_it++))
{
if (new_field->field == field)
break;
new_field_index++;
}
if (new_field)
{
/* Field is not dropped. Evaluate changes bitmap for it. */
/*
Check if type of column has changed to some incompatible type.
*/
switch (field->is_equal(new_field))
{
case IS_EQUAL_NO:
/* New column type is incompatible with old one. */
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_TYPE;
if (table->s->tmp_table == NO_TMP_TABLE)
{
delete_statistics_for_column(thd, table, field);
KEY *key_info= table->key_info;
for (uint i=0; i < table->s->keys; i++, key_info++)
{
if (field->part_of_key.is_set(i))
{
uint key_parts= table->actual_n_key_parts(key_info);
for (uint j= 0; j < key_parts; j++)
{
if (key_info->key_part[j].fieldnr-1 == field->field_index)
{
delete_statistics_for_index(thd, table, key_info,
j >= key_info->user_defined_key_parts);
break;
}
}
}
}
}
break;
case IS_EQUAL_YES:
/*
New column is the same as the old one or the fully compatible with
it (for example, ENUM('a','b') was changed to ENUM('a','b','c')).
Such a change if any can ALWAYS be carried out by simply updating
data-dictionary without even informing storage engine.
No flag is set in this case.
*/
break;
case IS_EQUAL_PACK_LENGTH:
/*
New column type differs from the old one, but has compatible packed
data representation. Depending on storage engine, such a change can
be carried out by simply updating data dictionary without changing
actual data (for example, VARCHAR(300) is changed to VARCHAR(400)).
*/
ha_alter_info->handler_flags|= Alter_inplace_info::
ALTER_COLUMN_EQUAL_PACK_LENGTH;
break;
default:
DBUG_ASSERT(0);
/* Safety. */
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_TYPE;
}
/*
Check if the altered column is computed and either
is stored or is used in the partitioning expression.
TODO: Mark such a column with an alter flag only if
the defining expression has changed.
*/
if (field->vcol_info &&
(field->stored_in_db || field->vcol_info->is_in_partitioning_expr()))
{
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_VCOL;
}
/* Check if field was renamed */
if (my_strcasecmp(system_charset_info, field->field_name,
new_field->field_name))
{
field->flags|= FIELD_IS_RENAMED;
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_NAME;
rename_column_in_stat_tables(thd, table, field,
new_field->field_name);
}
/* Check that NULL behavior is same for old and new fields */
if ((new_field->flags & NOT_NULL_FLAG) !=
(uint) (field->flags & NOT_NULL_FLAG))
{
if (new_field->flags & NOT_NULL_FLAG)
ha_alter_info->handler_flags|=
Alter_inplace_info::ALTER_COLUMN_NOT_NULLABLE;
else
ha_alter_info->handler_flags|=
Alter_inplace_info::ALTER_COLUMN_NULLABLE;
}
/*
We do not detect changes to default values in this loop.
See comment above for more details.
*/
/*
Detect changes in column order.
*/
if (field->field_index != new_field_index)
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_ORDER;
/* Detect changes in storage type of column */
if (new_field->field_storage_type() != field->field_storage_type())
ha_alter_info->handler_flags|=
Alter_inplace_info::ALTER_COLUMN_STORAGE_TYPE;
/* Detect changes in column format of column */
if (new_field->column_format() != field->column_format())
ha_alter_info->handler_flags|=
Alter_inplace_info::ALTER_COLUMN_COLUMN_FORMAT;
if (engine_options_differ(field->option_struct, new_field->option_struct,
table->file->ht->field_options))
{
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_OPTION;
ha_alter_info->create_info->fields_option_struct[f_ptr - table->field]=
new_field->option_struct;
}
}
else
{
/*
Field is not present in new version of table and therefore was dropped.
Corresponding storage engine flag should be already set.
*/
DBUG_ASSERT(ha_alter_info->handler_flags & Alter_inplace_info::DROP_COLUMN);
field->flags|= FIELD_IS_DROPPED;
}
}
new_field_it.init(alter_info->create_list);
while ((new_field= new_field_it++))
{
if (! new_field->field)
{
/*
Field is not present in old version of table and therefore was added.
Again corresponding storage engine flag should be already set.
*/
DBUG_ASSERT(ha_alter_info->handler_flags & Alter_inplace_info::ADD_COLUMN);
if (new_field->vcol_info &&
(new_field->stored_in_db || new_field->vcol_info->is_in_partitioning_expr()))
{
ha_alter_info->handler_flags|= Alter_inplace_info::ALTER_COLUMN_VCOL;
}
break;
}
}
/*
Go through keys and check if the original ones are compatible
with new table.
*/
KEY *table_key;
KEY *table_key_end= table->key_info + table->s->keys;
KEY *new_key;
KEY *new_key_end=
ha_alter_info->key_info_buffer + ha_alter_info->key_count;
DBUG_PRINT("info", ("index count old: %d new: %d",
table->s->keys, ha_alter_info->key_count));
/*
Step through all keys of the old table and search matching new keys.
*/
ha_alter_info->index_drop_count= 0;
ha_alter_info->index_add_count= 0;
for (table_key= table->key_info; table_key < table_key_end; table_key++)
{
/* Search a new key with the same name. */
for (new_key= ha_alter_info->key_info_buffer;
new_key < new_key_end;
new_key++)
{
if (! strcmp(table_key->name, new_key->name))
break;
}
if (new_key >= new_key_end)
{
/* Key not found. Add the key to the drop buffer. */
ha_alter_info->index_drop_buffer
[ha_alter_info->index_drop_count++]=
table_key;
DBUG_PRINT("info", ("index dropped: '%s'", table_key->name));
continue;
}
/* Check that the key types are compatible between old and new tables. */
if ((table_key->algorithm != new_key->algorithm) ||
((table_key->flags & HA_KEYFLAG_MASK) !=
(new_key->flags & HA_KEYFLAG_MASK)) ||
(table_key->user_defined_key_parts !=
new_key->user_defined_key_parts))
goto index_changed;
if (engine_options_differ(table_key->option_struct, new_key->option_struct,
table->file->ht->index_options))
goto index_changed;
/*
Check that the key parts remain compatible between the old and
new tables.
*/
end= table_key->key_part + table_key->user_defined_key_parts;
for (key_part= table_key->key_part, new_part= new_key->key_part;
key_part < end;
key_part++, new_part++)
{
/*
Key definition has changed if we are using a different field or
if the used key part length is different. It makes sense to
check lengths first as in case when fields differ it is likely
that lengths differ too and checking fields is more expensive
in general case.
*/
if (key_part->length != new_part->length)
goto index_changed;
new_field= get_field_by_index(alter_info, new_part->fieldnr);
/*
For prefix keys KEY_PART_INFO::field points to cloned Field
object with adjusted length. So below we have to check field
indexes instead of simply comparing pointers to Field objects.
*/
if (! new_field->field ||
new_field->field->field_index != key_part->fieldnr - 1)
goto index_changed;
}
continue;
index_changed:
/* Key modified. Add the key / key offset to both buffers. */
ha_alter_info->index_drop_buffer
[ha_alter_info->index_drop_count++]=
table_key;
ha_alter_info->index_add_buffer
[ha_alter_info->index_add_count++]=
new_key - ha_alter_info->key_info_buffer;
/* Mark all old fields which are used in newly created index. */
DBUG_PRINT("info", ("index changed: '%s'", table_key->name));
}
/*end of for (; table_key < table_key_end;) */
/*
Step through all keys of the new table and find matching old keys.
*/
for (new_key= ha_alter_info->key_info_buffer;
new_key < new_key_end;
new_key++)
{
/* Search an old key with the same name. */
for (table_key= table->key_info; table_key < table_key_end; table_key++)
{
if (! strcmp(table_key->name, new_key->name))
break;
}
if (table_key >= table_key_end)
{
/* Key not found. Add the offset of the key to the add buffer. */
ha_alter_info->index_add_buffer
[ha_alter_info->index_add_count++]=
new_key - ha_alter_info->key_info_buffer;
DBUG_PRINT("info", ("index added: '%s'", new_key->name));
}
else
ha_alter_info->create_info->indexes_option_struct[table_key - table->key_info]=
new_key->option_struct;
}
/*
Sort index_add_buffer according to how key_info_buffer is sorted.
I.e. with primary keys first - see sort_keys().
*/
my_qsort(ha_alter_info->index_add_buffer,
ha_alter_info->index_add_count,
sizeof(uint), (qsort_cmp) compare_uint);
/* Now let us calculate flags for storage engine API. */
/* Count all existing candidate keys. */
for (table_key= table->key_info; table_key < table_key_end; table_key++)
{
/*
Check if key is a candidate key, This key is either already primary key
or could be promoted to primary key if the original primary key is
dropped.
In MySQL one is allowed to create primary key with partial fields (i.e.
primary key which is not considered candidate). For simplicity we count
such key as a candidate key here.
*/
if (((uint) (table_key - table->key_info) == table->s->primary_key) ||
is_candidate_key(table_key))
candidate_key_count++;
}
/* Figure out what kind of indexes we are dropping. */
KEY **dropped_key;
KEY **dropped_key_end= ha_alter_info->index_drop_buffer +
ha_alter_info->index_drop_count;
for (dropped_key= ha_alter_info->index_drop_buffer;
dropped_key < dropped_key_end; dropped_key++)
{
table_key= *dropped_key;
if (table_key->flags & HA_NOSAME)
{
/*
Unique key. Check for PRIMARY KEY. Also see comment about primary
and candidate keys above.
*/
if ((uint) (table_key - table->key_info) == table->s->primary_key)
{
ha_alter_info->handler_flags|= Alter_inplace_info::DROP_PK_INDEX;
candidate_key_count--;
}
else
{
ha_alter_info->handler_flags|= Alter_inplace_info::DROP_UNIQUE_INDEX;
if (is_candidate_key(table_key))
candidate_key_count--;
}
}
else
ha_alter_info->handler_flags|= Alter_inplace_info::DROP_INDEX;
}
/* Now figure out what kind of indexes we are adding. */
for (uint add_key_idx= 0; add_key_idx < ha_alter_info->index_add_count; add_key_idx++)
{
new_key= ha_alter_info->key_info_buffer + ha_alter_info->index_add_buffer[add_key_idx];
if (new_key->flags & HA_NOSAME)
{
bool is_pk= !my_strcasecmp(system_charset_info, new_key->name, primary_key_name);
if ((!(new_key->flags & HA_KEY_HAS_PART_KEY_SEG) &&
!(new_key->flags & HA_NULL_PART_KEY)) ||
is_pk)
{
/* Candidate key or primary key! */
if (candidate_key_count == 0 || is_pk)
ha_alter_info->handler_flags|= Alter_inplace_info::ADD_PK_INDEX;
else
ha_alter_info->handler_flags|= Alter_inplace_info::ADD_UNIQUE_INDEX;
candidate_key_count++;
}
else
{
ha_alter_info->handler_flags|= Alter_inplace_info::ADD_UNIQUE_INDEX;
}
}
else
ha_alter_info->handler_flags|= Alter_inplace_info::ADD_INDEX;
}
DBUG_RETURN(false);
}
/**
Mark fields participating in newly added indexes in TABLE object which
corresponds to new version of altered table.
@param ha_alter_info Alter_inplace_info describing in-place ALTER.
@param altered_table TABLE object for new version of TABLE in which
fields should be marked.
*/
static void update_altered_table(const Alter_inplace_info &ha_alter_info,
TABLE *altered_table)
{
uint field_idx, add_key_idx;
KEY *key;
KEY_PART_INFO *end, *key_part;
/*
Clear marker for all fields, as we are going to set it only
for fields which participate in new indexes.
*/
for (field_idx= 0; field_idx < altered_table->s->fields; ++field_idx)
altered_table->field[field_idx]->flags&= ~FIELD_IN_ADD_INDEX;
/*
Go through array of newly added indexes and mark fields
participating in them.
*/
for (add_key_idx= 0; add_key_idx < ha_alter_info.index_add_count;
add_key_idx++)
{
key= ha_alter_info.key_info_buffer +
ha_alter_info.index_add_buffer[add_key_idx];
end= key->key_part + key->user_defined_key_parts;
for (key_part= key->key_part; key_part < end; key_part++)
altered_table->field[key_part->fieldnr]->flags|= FIELD_IN_ADD_INDEX;
}
}
/**
Compare two tables to see if their metadata are compatible.
One table specified by a TABLE instance, the other using Alter_info
and HA_CREATE_INFO.
@param[in] table The first table.
@param[in] alter_info Alter options, fields and keys for the
second table.
@param[in] create_info Create options for the second table.
@param[out] metadata_equal Result of comparison.
@retval true error
@retval false success
*/
bool mysql_compare_tables(TABLE *table,
Alter_info *alter_info,
HA_CREATE_INFO *create_info,
bool *metadata_equal)
{
DBUG_ENTER("mysql_compare_tables");
uint changes= IS_EQUAL_NO;
uint key_count;
List_iterator_fast<Create_field> tmp_new_field_it;
THD *thd= table->in_use;
*metadata_equal= false;
/*
Create a copy of alter_info.
To compare definitions, we need to "prepare" the definition - transform it
from parser output to a format that describes the table layout (all column
defaults are initialized, duplicate columns are removed). This is done by
mysql_prepare_create_table. Unfortunately, mysql_prepare_create_table
performs its transformations "in-place", that is, modifies the argument.
Since we would like to keep mysql_compare_tables() idempotent (not altering
any of the arguments) we create a copy of alter_info here and pass it to
mysql_prepare_create_table, then use the result to compare the tables, and
then destroy the copy.
*/
Alter_info tmp_alter_info(*alter_info, thd->mem_root);
uint db_options= 0; /* not used */
KEY *key_info_buffer= NULL;
/* Create the prepared information. */
int create_table_mode= table->s->tmp_table == NO_TMP_TABLE ?
C_ORDINARY_CREATE : C_ALTER_TABLE;
if (mysql_prepare_create_table(thd, create_info, &tmp_alter_info,
&db_options, table->file, &key_info_buffer,
&key_count, create_table_mode))
DBUG_RETURN(1);
/* Some very basic checks. */
if (table->s->fields != alter_info->create_list.elements ||
table->s->db_type() != create_info->db_type ||
table->s->tmp_table ||
(table->s->row_type != create_info->row_type))
DBUG_RETURN(false);
/* Go through fields and check if they are compatible. */
tmp_new_field_it.init(tmp_alter_info.create_list);
for (Field **f_ptr= table->field; *f_ptr; f_ptr++)
{
Field *field= *f_ptr;
Create_field *tmp_new_field= tmp_new_field_it++;
/* Check that NULL behavior is the same. */
if ((tmp_new_field->flags & NOT_NULL_FLAG) !=
(uint) (field->flags & NOT_NULL_FLAG))
DBUG_RETURN(false);
/*
mysql_prepare_alter_table() clears HA_OPTION_PACK_RECORD bit when
preparing description of existing table. In ALTER TABLE it is later
updated to correct value by create_table_impl() call.
So to get correct value of this bit in this function we have to
mimic behavior of create_table_impl().
*/
if (create_info->row_type == ROW_TYPE_DYNAMIC ||
create_info->row_type == ROW_TYPE_PAGE ||
(tmp_new_field->flags & BLOB_FLAG) ||
(tmp_new_field->sql_type == MYSQL_TYPE_VARCHAR &&
create_info->row_type != ROW_TYPE_FIXED))
create_info->table_options|= HA_OPTION_PACK_RECORD;
/* Check if field was renamed */
if (my_strcasecmp(system_charset_info,
field->field_name,
tmp_new_field->field_name))
DBUG_RETURN(false);
/* Evaluate changes bitmap and send to check_if_incompatible_data() */
uint field_changes= field->is_equal(tmp_new_field);
if (field_changes != IS_EQUAL_YES)
DBUG_RETURN(false);
changes|= field_changes;
}
/* Check if changes are compatible with current handler. */
if (table->file->check_if_incompatible_data(create_info, changes))
DBUG_RETURN(false);
/* Go through keys and check if they are compatible. */
KEY *table_key;
KEY *table_key_end= table->key_info + table->s->keys;
KEY *new_key;
KEY *new_key_end= key_info_buffer + key_count;
/* Step through all keys of the first table and search matching keys. */
for (table_key= table->key_info; table_key < table_key_end; table_key++)
{
/* Search a key with the same name. */
for (new_key= key_info_buffer; new_key < new_key_end; new_key++)
{
if (! strcmp(table_key->name, new_key->name))
break;
}
if (new_key >= new_key_end)
DBUG_RETURN(false);
/* Check that the key types are compatible. */
if ((table_key->algorithm != new_key->algorithm) ||
((table_key->flags & HA_KEYFLAG_MASK) !=
(new_key->flags & HA_KEYFLAG_MASK)) ||
(table_key->user_defined_key_parts !=
new_key->user_defined_key_parts))
DBUG_RETURN(false);
/* Check that the key parts remain compatible. */
KEY_PART_INFO *table_part;
KEY_PART_INFO *table_part_end= table_key->key_part + table_key->user_defined_key_parts;
KEY_PART_INFO *new_part;
for (table_part= table_key->key_part, new_part= new_key->key_part;
table_part < table_part_end;
table_part++, new_part++)
{
/*
Key definition is different if we are using a different field or
if the used key part length is different. We know that the fields
are equal. Comparing field numbers is sufficient.
*/
if ((table_part->length != new_part->length) ||
(table_part->fieldnr - 1 != new_part->fieldnr))
DBUG_RETURN(false);
}
}
/* Step through all keys of the second table and find matching keys. */
for (new_key= key_info_buffer; new_key < new_key_end; new_key++)
{
/* Search a key with the same name. */
for (table_key= table->key_info; table_key < table_key_end; table_key++)
{
if (! strcmp(table_key->name, new_key->name))
break;
}
if (table_key >= table_key_end)
DBUG_RETURN(false);
}
*metadata_equal= true; // Tables are compatible
DBUG_RETURN(false);
}
/*
Manages enabling/disabling of indexes for ALTER TABLE
SYNOPSIS
alter_table_manage_keys()
table Target table
indexes_were_disabled Whether the indexes of the from table
were disabled
keys_onoff ENABLE | DISABLE | LEAVE_AS_IS
RETURN VALUES
FALSE OK
TRUE Error
*/
static
bool alter_table_manage_keys(TABLE *table, int indexes_were_disabled,
Alter_info::enum_enable_or_disable keys_onoff)
{
int error= 0;
DBUG_ENTER("alter_table_manage_keys");
DBUG_PRINT("enter", ("table=%p were_disabled=%d on_off=%d",
table, indexes_were_disabled, keys_onoff));
switch (keys_onoff) {
case Alter_info::ENABLE:
DEBUG_SYNC(table->in_use, "alter_table_enable_indexes");
error= table->file->ha_enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
break;
case Alter_info::LEAVE_AS_IS:
if (!indexes_were_disabled)
break;
/* fall-through: disabled indexes */
case Alter_info::DISABLE:
error= table->file->ha_disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
}
if (error == HA_ERR_WRONG_COMMAND)
{
push_warning_printf(current_thd, Sql_condition::WARN_LEVEL_NOTE,
ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA),
table->file->table_type(),
table->s->db.str, table->s->table_name.str);
error= 0;
} else if (error)
table->file->print_error(error, MYF(0));
DBUG_RETURN(error);
}
/**
Check if the pending ALTER TABLE operations support the in-place
algorithm based on restrictions in the SQL layer or given the
nature of the operations themselves. If in-place isn't supported,
it won't be necessary to check with the storage engine.
@param table The original TABLE.
@param create_info Information from the parsing phase about new
table properties.
@param alter_info Data related to detected changes.
@return false In-place is possible, check with storage engine.
@return true Incompatible operations, must use table copy.
*/
static bool is_inplace_alter_impossible(TABLE *table,
HA_CREATE_INFO *create_info,
const Alter_info *alter_info)
{
DBUG_ENTER("is_inplace_alter_impossible");
/* At the moment we can't handle altering temporary tables without a copy. */
if (table->s->tmp_table)
DBUG_RETURN(true);
/*
For the ALTER TABLE tbl_name ORDER BY ... we always use copy
algorithm. In theory, this operation can be done in-place by some
engine, but since a) no current engine does this and b) our current
API lacks infrastructure for passing information about table ordering
to storage engine we simply always do copy now.
ENABLE/DISABLE KEYS is a MyISAM/Heap specific operation that is
not supported for in-place in combination with other operations.
Alone, it will be done by simple_rename_or_index_change().
*/
if (alter_info->flags & (Alter_info::ALTER_ORDER |
Alter_info::ALTER_KEYS_ONOFF))
DBUG_RETURN(true);
/*
If the table engine is changed explicitly (using ENGINE clause)
or implicitly (e.g. when non-partitioned table becomes
partitioned) a regular alter table (copy) needs to be
performed.
*/
if (create_info->db_type != table->s->db_type())
DBUG_RETURN(true);
/*
There was a bug prior to mysql-4.0.25. Number of null fields was
calculated incorrectly. As a result frm and data files gets out of
sync after fast alter table. There is no way to determine by which
mysql version (in 4.0 and 4.1 branches) table was created, thus we
disable fast alter table for all tables created by mysql versions
prior to 5.0 branch.
See BUG#6236.
*/
if (!table->s->mysql_version)
DBUG_RETURN(true);
DBUG_RETURN(false);
}
/**
Perform in-place alter table.
@param thd Thread handle.
@param table_list TABLE_LIST for the table to change.
@param table The original TABLE.
@param altered_table TABLE object for new version of the table.
@param ha_alter_info Structure describing ALTER TABLE to be carried
out and serving as a storage place for data
used during different phases.
@param inplace_supported Enum describing the locking requirements.
@param target_mdl_request Metadata request/lock on the target table name.
@param alter_ctx ALTER TABLE runtime context.
@retval true Error
@retval false Success
@note
If mysql_alter_table does not need to copy the table, it is
either an alter table where the storage engine does not
need to know about the change, only the frm will change,
or the storage engine supports performing the alter table
operation directly, in-place without mysql having to copy
the table.
@note This function frees the TABLE object associated with the new version of
the table and removes the .FRM file for it in case of both success and
failure.
*/
static bool mysql_inplace_alter_table(THD *thd,
TABLE_LIST *table_list,
TABLE *table,
TABLE *altered_table,
Alter_inplace_info *ha_alter_info,
enum_alter_inplace_result inplace_supported,
MDL_request *target_mdl_request,
Alter_table_ctx *alter_ctx)
{
Open_table_context ot_ctx(thd, MYSQL_OPEN_REOPEN);
handlerton *db_type= table->s->db_type();
MDL_ticket *mdl_ticket= table->mdl_ticket;
HA_CREATE_INFO *create_info= ha_alter_info->create_info;
Alter_info *alter_info= ha_alter_info->alter_info;
bool reopen_tables= false;
DBUG_ENTER("mysql_inplace_alter_table");
/*
Upgrade to EXCLUSIVE lock if:
- This is requested by the storage engine
- Or the storage engine needs exclusive lock for just the prepare
phase
- Or requested by the user
Note that we handle situation when storage engine needs exclusive
lock for prepare phase under LOCK TABLES in the same way as when
exclusive lock is required for duration of the whole statement.
*/
if (inplace_supported == HA_ALTER_INPLACE_EXCLUSIVE_LOCK ||
((inplace_supported == HA_ALTER_INPLACE_SHARED_LOCK_AFTER_PREPARE ||
inplace_supported == HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE) &&
(thd->locked_tables_mode == LTM_LOCK_TABLES ||
thd->locked_tables_mode == LTM_PRELOCKED_UNDER_LOCK_TABLES)) ||
alter_info->requested_lock == Alter_info::ALTER_TABLE_LOCK_EXCLUSIVE)
{
if (wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
goto cleanup;
/*
Get rid of all TABLE instances belonging to this thread
except one to be used for in-place ALTER TABLE.
This is mostly needed to satisfy InnoDB assumptions/asserts.
*/
close_all_tables_for_name(thd, table->s,
alter_ctx->is_table_renamed() ?
HA_EXTRA_PREPARE_FOR_RENAME :
HA_EXTRA_NOT_USED,
table);
/*
If we are under LOCK TABLES we will need to reopen tables which we
just have closed in case of error.
*/
reopen_tables= true;
}
else if (inplace_supported == HA_ALTER_INPLACE_SHARED_LOCK_AFTER_PREPARE ||
inplace_supported == HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE)
{
/*
Storage engine has requested exclusive lock only for prepare phase
and we are not under LOCK TABLES.
Don't mark TABLE_SHARE as old in this case, as this won't allow opening
of table by other threads during main phase of in-place ALTER TABLE.
*/
if (thd->mdl_context.upgrade_shared_lock(table->mdl_ticket, MDL_EXCLUSIVE,
thd->variables.lock_wait_timeout))
goto cleanup;
tdc_remove_table(thd, TDC_RT_REMOVE_NOT_OWN_KEEP_SHARE,
table->s->db.str, table->s->table_name.str,
false);
}
/*
Upgrade to SHARED_NO_WRITE lock if:
- The storage engine needs writes blocked for the whole duration
- Or this is requested by the user
Note that under LOCK TABLES, we will already have SHARED_NO_READ_WRITE.
*/
if ((inplace_supported == HA_ALTER_INPLACE_SHARED_LOCK ||
alter_info->requested_lock == Alter_info::ALTER_TABLE_LOCK_SHARED) &&
thd->mdl_context.upgrade_shared_lock(table->mdl_ticket,
MDL_SHARED_NO_WRITE,
thd->variables.lock_wait_timeout))
{
goto cleanup;
}
// It's now safe to take the table level lock.
if (lock_tables(thd, table_list, alter_ctx->tables_opened, 0))
goto cleanup;
DEBUG_SYNC(thd, "alter_table_inplace_after_lock_upgrade");
THD_STAGE_INFO(thd, stage_alter_inplace_prepare);
switch (inplace_supported) {
case HA_ALTER_ERROR:
case HA_ALTER_INPLACE_NOT_SUPPORTED:
DBUG_ASSERT(0);
// fall through
case HA_ALTER_INPLACE_NO_LOCK:
case HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE:
switch (alter_info->requested_lock) {
case Alter_info::ALTER_TABLE_LOCK_DEFAULT:
case Alter_info::ALTER_TABLE_LOCK_NONE:
ha_alter_info->online= true;
break;
case Alter_info::ALTER_TABLE_LOCK_SHARED:
case Alter_info::ALTER_TABLE_LOCK_EXCLUSIVE:
break;
}
break;
case HA_ALTER_INPLACE_EXCLUSIVE_LOCK:
case HA_ALTER_INPLACE_SHARED_LOCK_AFTER_PREPARE:
case HA_ALTER_INPLACE_SHARED_LOCK:
break;
}
if (table->file->ha_prepare_inplace_alter_table(altered_table,
ha_alter_info))
{
goto rollback;
}
/*
Downgrade the lock if storage engine has told us that exclusive lock was
necessary only for prepare phase (unless we are not under LOCK TABLES) and
user has not explicitly requested exclusive lock.
*/
if ((inplace_supported == HA_ALTER_INPLACE_SHARED_LOCK_AFTER_PREPARE ||
inplace_supported == HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE) &&
!(thd->locked_tables_mode == LTM_LOCK_TABLES ||
thd->locked_tables_mode == LTM_PRELOCKED_UNDER_LOCK_TABLES) &&
(alter_info->requested_lock != Alter_info::ALTER_TABLE_LOCK_EXCLUSIVE))
{
/* If storage engine or user requested shared lock downgrade to SNW. */
if (inplace_supported == HA_ALTER_INPLACE_SHARED_LOCK_AFTER_PREPARE ||
alter_info->requested_lock == Alter_info::ALTER_TABLE_LOCK_SHARED)
table->mdl_ticket->downgrade_lock(MDL_SHARED_NO_WRITE);
else
{
DBUG_ASSERT(inplace_supported == HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE);
table->mdl_ticket->downgrade_lock(MDL_SHARED_UPGRADABLE);
}
}
DEBUG_SYNC(thd, "alter_table_inplace_after_lock_downgrade");
THD_STAGE_INFO(thd, stage_alter_inplace);
if (table->file->ha_inplace_alter_table(altered_table,
ha_alter_info))
{
goto rollback;
}
// Upgrade to EXCLUSIVE before commit.
if (wait_while_table_is_used(thd, table, HA_EXTRA_PREPARE_FOR_RENAME))
goto rollback;
/*
If we are killed after this point, we should ignore and continue.
We have mostly completed the operation at this point, there should
be no long waits left.
*/
DBUG_EXECUTE_IF("alter_table_rollback_new_index", {
table->file->ha_commit_inplace_alter_table(altered_table,
ha_alter_info,
false);
my_error(ER_UNKNOWN_ERROR, MYF(0));
goto cleanup;
});
DEBUG_SYNC(thd, "alter_table_inplace_before_commit");
THD_STAGE_INFO(thd, stage_alter_inplace_commit);
if (table->file->ha_commit_inplace_alter_table(altered_table,
ha_alter_info,
true))
{
goto rollback;
}
close_all_tables_for_name(thd, table->s,
alter_ctx->is_table_renamed() ?
HA_EXTRA_PREPARE_FOR_RENAME :
HA_EXTRA_NOT_USED,
NULL);
table_list->table= table= NULL;
close_temporary_table(thd, altered_table, true, false);
/*
Replace the old .FRM with the new .FRM, but keep the old name for now.
Rename to the new name (if needed) will be handled separately below.
*/
if (mysql_rename_table(db_type, alter_ctx->new_db, alter_ctx->tmp_name,
alter_ctx->db, alter_ctx->alias,
FN_FROM_IS_TMP | NO_HA_TABLE))
{
// Since changes were done in-place, we can't revert them.
(void) quick_rm_table(thd, db_type,
alter_ctx->new_db, alter_ctx->tmp_name,
FN_IS_TMP | NO_HA_TABLE);
DBUG_RETURN(true);
}
table_list->mdl_request.ticket= mdl_ticket;
if (open_table(thd, table_list, &ot_ctx))
DBUG_RETURN(true);
/*
Tell the handler that the changed frm is on disk and table
has been re-opened
*/
table_list->table->file->ha_notify_table_changed();
/*
We might be going to reopen table down on the road, so we have to
restore state of the TABLE object which we used for obtaining of
handler object to make it usable for later reopening.
*/
close_thread_table(thd, &thd->open_tables);
table_list->table= NULL;
// Rename altered table if requested.
if (alter_ctx->is_table_renamed())
{
// Remove TABLE and TABLE_SHARE for old name from TDC.
tdc_remove_table(thd, TDC_RT_REMOVE_ALL,
alter_ctx->db, alter_ctx->table_name, false);
if (mysql_rename_table(db_type, alter_ctx->db, alter_ctx->table_name,
alter_ctx->new_db, alter_ctx->new_alias, 0))
{
/*
If the rename fails we will still have a working table
with the old name, but with other changes applied.
*/
DBUG_RETURN(true);
}
if (Table_triggers_list::change_table_name(thd,
alter_ctx->db,
alter_ctx->alias,
alter_ctx->table_name,
alter_ctx->new_db,
alter_ctx->new_alias))
{
/*
If the rename of trigger files fails, try to rename the table
back so we at least have matching table and trigger files.
*/
(void) mysql_rename_table(db_type,
alter_ctx->new_db, alter_ctx->new_alias,
alter_ctx->db, alter_ctx->alias, NO_FK_CHECKS);
DBUG_RETURN(true);
}
rename_table_in_stat_tables(thd, alter_ctx->db,alter_ctx->alias,
alter_ctx->new_db, alter_ctx->new_alias);
}
DBUG_RETURN(false);
rollback:
table->file->ha_commit_inplace_alter_table(altered_table,
ha_alter_info,
false);
cleanup:
if (reopen_tables)
{
/* Close the only table instance which is still around. */
close_all_tables_for_name(thd, table->s,
alter_ctx->is_table_renamed() ?
HA_EXTRA_PREPARE_FOR_RENAME :
HA_EXTRA_NOT_USED,
NULL);
if (thd->locked_tables_list.reopen_tables(thd))
thd->locked_tables_list.unlink_all_closed_tables(thd, NULL, 0);
/* QQ; do something about metadata locks ? */
}
close_temporary_table(thd, altered_table, true, false);
// Delete temporary .frm/.par
(void) quick_rm_table(thd, create_info->db_type, alter_ctx->new_db,
alter_ctx->tmp_name, FN_IS_TMP | NO_HA_TABLE);
DBUG_RETURN(true);
}
/**
maximum possible length for certain blob types.
@param[in] type Blob type (e.g. MYSQL_TYPE_TINY_BLOB)
@return
length
*/
static uint
blob_length_by_type(enum_field_types type)
{
switch (type)
{
case MYSQL_TYPE_TINY_BLOB:
return 255;
case MYSQL_TYPE_BLOB:
return 65535;
case MYSQL_TYPE_MEDIUM_BLOB:
return 16777215;
case MYSQL_TYPE_LONG_BLOB:
return 4294967295U;
default:
DBUG_ASSERT(0); // we should never go here
return 0;
}
}
/**
Prepare column and key definitions for CREATE TABLE in ALTER TABLE.
This function transforms parse output of ALTER TABLE - lists of
columns and keys to add, drop or modify into, essentially,
CREATE TABLE definition - a list of columns and keys of the new
table. While doing so, it also performs some (bug not all)
semantic checks.
This function is invoked when we know that we're going to
perform ALTER TABLE via a temporary table -- i.e. in-place ALTER TABLE
is not possible, perhaps because the ALTER statement contains
instructions that require change in table data, not only in
table definition or indexes.
@param[in,out] thd thread handle. Used as a memory pool
and source of environment information.
@param[in] table the source table, open and locked
Used as an interface to the storage engine
to acquire additional information about
the original table.
@param[in,out] create_info A blob with CREATE/ALTER TABLE
parameters
@param[in,out] alter_info Another blob with ALTER/CREATE parameters.
Originally create_info was used only in
CREATE TABLE and alter_info only in ALTER TABLE.
But since ALTER might end-up doing CREATE,
this distinction is gone and we just carry
around two structures.
@param[in,out] alter_ctx Runtime context for ALTER TABLE.
@return
Fills various create_info members based on information retrieved
from the storage engine.
Sets create_info->varchar if the table has a VARCHAR column.
Prepares alter_info->create_list and alter_info->key_list with
columns and keys of the new table.
@retval TRUE error, out of memory or a semantical error in ALTER
TABLE instructions
@retval FALSE success
*/
bool
mysql_prepare_alter_table(THD *thd, TABLE *table,
HA_CREATE_INFO *create_info,
Alter_info *alter_info,
Alter_table_ctx *alter_ctx)
{
/* New column definitions are added here */
List<Create_field> new_create_list;
/* New key definitions are added here */
List<Key> new_key_list;
List_iterator<Alter_drop> drop_it(alter_info->drop_list);
List_iterator<Create_field> def_it(alter_info->create_list);
List_iterator<Alter_column> alter_it(alter_info->alter_list);
List_iterator<Key> key_it(alter_info->key_list);
List_iterator<Create_field> find_it(new_create_list);
List_iterator<Create_field> field_it(new_create_list);
List<Key_part_spec> key_parts;
uint db_create_options= (table->s->db_create_options
& ~(HA_OPTION_PACK_RECORD));
uint used_fields;
KEY *key_info=table->key_info;
bool rc= TRUE;
bool modified_primary_key= FALSE;
Create_field *def;
Field **f_ptr,*field;
DBUG_ENTER("mysql_prepare_alter_table");
/*
Merge incompatible changes flag in case of upgrade of a table from an
old MariaDB or MySQL version. This ensures that we don't try to do an
online alter table if field packing or character set changes are required.
*/
create_info->used_fields|= table->s->incompatible_version;
used_fields= create_info->used_fields;
create_info->varchar= FALSE;
/* Let new create options override the old ones */
if (!(used_fields & HA_CREATE_USED_MIN_ROWS))
create_info->min_rows= table->s->min_rows;
if (!(used_fields & HA_CREATE_USED_MAX_ROWS))
create_info->max_rows= table->s->max_rows;
if (!(used_fields & HA_CREATE_USED_AVG_ROW_LENGTH))
create_info->avg_row_length= table->s->avg_row_length;
if (!(used_fields & HA_CREATE_USED_DEFAULT_CHARSET))
create_info->default_table_charset= table->s->table_charset;
if (!(used_fields & HA_CREATE_USED_AUTO) && table->found_next_number_field)
{
/* Table has an autoincrement, copy value to new table */
table->file->info(HA_STATUS_AUTO);
create_info->auto_increment_value= table->file->stats.auto_increment_value;
}
if (!(used_fields & HA_CREATE_USED_KEY_BLOCK_SIZE))
create_info->key_block_size= table->s->key_block_size;
if (!(used_fields & HA_CREATE_USED_STATS_SAMPLE_PAGES))
create_info->stats_sample_pages= table->s->stats_sample_pages;
if (!(used_fields & HA_CREATE_USED_STATS_AUTO_RECALC))
create_info->stats_auto_recalc= table->s->stats_auto_recalc;
if (!(used_fields & HA_CREATE_USED_TRANSACTIONAL))
create_info->transactional= table->s->transactional;
if (!(used_fields & HA_CREATE_USED_CONNECTION))
create_info->connect_string= table->s->connect_string;
restore_record(table, s->default_values); // Empty record for DEFAULT
if ((create_info->fields_option_struct= (ha_field_option_struct**)
thd->calloc(sizeof(void*) * table->s->fields)) == NULL ||
(create_info->indexes_option_struct= (ha_index_option_struct**)
thd->calloc(sizeof(void*) * table->s->keys)) == NULL)
DBUG_RETURN(1);
create_info->option_list= merge_engine_table_options(table->s->option_list,
create_info->option_list, thd->mem_root);
/*
First collect all fields from table which isn't in drop_list
*/
for (f_ptr=table->field ; (field= *f_ptr) ; f_ptr++)
{
Alter_drop *drop;
if (field->type() == MYSQL_TYPE_VARCHAR)
create_info->varchar= TRUE;
/* Check if field should be dropped */
drop_it.rewind();
while ((drop=drop_it++))
{
if (drop->type == Alter_drop::COLUMN &&
!my_strcasecmp(system_charset_info,field->field_name, drop->name))
{
/* Reset auto_increment value if it was dropped */
if (MTYP_TYPENR(field->unireg_check) == Field::NEXT_NUMBER &&
!(used_fields & HA_CREATE_USED_AUTO))
{
create_info->auto_increment_value=0;
create_info->used_fields|=HA_CREATE_USED_AUTO;
}
break;
}
}
if (drop)
{
if (table->s->tmp_table == NO_TMP_TABLE)
(void) delete_statistics_for_column(thd, table, field);
drop_it.remove();
continue;
}
/* Check if field is changed */
def_it.rewind();
while ((def=def_it++))
{
if (def->change &&
!my_strcasecmp(system_charset_info,field->field_name, def->change))
break;
}
if (def)
{ // Field is changed
def->field=field;
/*
Add column being updated to the list of new columns.
Note that columns with AFTER clauses are added to the end
of the list for now. Their positions will be corrected later.
*/
new_create_list.push_back(def);
if (field->stored_in_db != def->stored_in_db)
{
my_error(ER_UNSUPPORTED_ACTION_ON_VIRTUAL_COLUMN, MYF(0));
goto err;
}
if (!def->after)
{
/*
If this ALTER TABLE doesn't have an AFTER clause for the modified
column then remove this column from the list of columns to be
processed. So later we can iterate over the columns remaining
in this list and process modified columns with AFTER clause or
add new columns.
*/
def_it.remove();
}
}
else
{
/*
This field was not dropped and not changed, add it to the list
for the new table.
*/
def= new Create_field(field, field);
new_create_list.push_back(def);
alter_it.rewind(); // Change default if ALTER
Alter_column *alter;
while ((alter=alter_it++))
{
if (!my_strcasecmp(system_charset_info,field->field_name, alter->name))
break;
}
if (alter)
{
if (def->sql_type == MYSQL_TYPE_BLOB)
{
my_error(ER_BLOB_CANT_HAVE_DEFAULT, MYF(0), def->change);
goto err;
}
if ((def->def=alter->def)) // Use new default
def->flags&= ~NO_DEFAULT_VALUE_FLAG;
else
def->flags|= NO_DEFAULT_VALUE_FLAG;
alter_it.remove();
}
}
}
def_it.rewind();
while ((def=def_it++)) // Add new columns
{
if (def->change && ! def->field)
{
my_error(ER_BAD_FIELD_ERROR, MYF(0), def->change,
table->s->table_name.str);
goto err;
}
/*
Check that the DATE/DATETIME not null field we are going to add is
either has a default value or the '0000-00-00' is allowed by the
set sql mode.
If the '0000-00-00' value isn't allowed then raise the error_if_not_empty
flag to allow ALTER TABLE only if the table to be altered is empty.
*/
if ((def->sql_type == MYSQL_TYPE_DATE ||
def->sql_type == MYSQL_TYPE_NEWDATE ||
def->sql_type == MYSQL_TYPE_DATETIME ||
def->sql_type == MYSQL_TYPE_DATETIME2) &&
!alter_ctx->datetime_field &&
!(~def->flags & (NO_DEFAULT_VALUE_FLAG | NOT_NULL_FLAG)) &&
thd->variables.sql_mode & MODE_NO_ZERO_DATE)
{
alter_ctx->datetime_field= def;
alter_ctx->error_if_not_empty= TRUE;
}
if (!def->after)
new_create_list.push_back(def);
else
{
Create_field *find;
if (def->change)
{
find_it.rewind();
/*
For columns being modified with AFTER clause we should first remove
these columns from the list and then add them back at their correct
positions.
*/
while ((find=find_it++))
{
/*
Create_fields representing changed columns are added directly
from Alter_info::create_list to new_create_list. We can therefore
safely use pointer equality rather than name matching here.
This prevents removing the wrong column in case of column rename.
*/
if (find == def)
{
find_it.remove();
break;
}
}
}
if (def->after == first_keyword)
new_create_list.push_front(def);
else
{
find_it.rewind();
while ((find=find_it++))
{
if (!my_strcasecmp(system_charset_info, def->after, find->field_name))
break;
}
if (!find)
{
my_error(ER_BAD_FIELD_ERROR, MYF(0), def->after, table->s->table_name.str);
goto err;
}
find_it.after(def); // Put column after this
}
}
}
if (alter_info->alter_list.elements)
{
my_error(ER_BAD_FIELD_ERROR, MYF(0),
alter_info->alter_list.head()->name, table->s->table_name.str);
goto err;
}
if (!new_create_list.elements)
{
my_message(ER_CANT_REMOVE_ALL_FIELDS, ER(ER_CANT_REMOVE_ALL_FIELDS),
MYF(0));
goto err;
}
/*
Collect all keys which isn't in drop list. Add only those
for which some fields exists.
*/
for (uint i=0 ; i < table->s->keys ; i++,key_info++)
{
char *key_name= key_info->name;
Alter_drop *drop;
drop_it.rewind();
while ((drop=drop_it++))
{
if (drop->type == Alter_drop::KEY &&
!my_strcasecmp(system_charset_info,key_name, drop->name))
break;
}
if (drop)
{
if (table->s->tmp_table == NO_TMP_TABLE)
{
(void) delete_statistics_for_index(thd, table, key_info, FALSE);
if (i == table->s->primary_key)
{
KEY *tab_key_info= table->key_info;
for (uint j=0; j < table->s->keys; j++, tab_key_info++)
{
if (tab_key_info->user_defined_key_parts !=
tab_key_info->ext_key_parts)
(void) delete_statistics_for_index(thd, table, tab_key_info,
TRUE);
}
}
}
drop_it.remove();
continue;
}
KEY_PART_INFO *key_part= key_info->key_part;
key_parts.empty();
bool delete_index_stat= FALSE;
for (uint j=0 ; j < key_info->user_defined_key_parts ; j++,key_part++)
{
if (!key_part->field)
continue; // Wrong field (from UNIREG)
const char *key_part_name=key_part->field->field_name;
Create_field *cfield;
uint key_part_length;
field_it.rewind();
while ((cfield=field_it++))
{
if (cfield->change)
{
if (!my_strcasecmp(system_charset_info, key_part_name,
cfield->change))
break;
}
else if (!my_strcasecmp(system_charset_info,
key_part_name, cfield->field_name))
break;
}
if (!cfield)
{
if (table->s->primary_key == i)
modified_primary_key= TRUE;
delete_index_stat= TRUE;
continue; // Field is removed
}
key_part_length= key_part->length;
if (cfield->field) // Not new field
{
/*
If the field can't have only a part used in a key according to its
new type, or should not be used partially according to its
previous type, or the field length is less than the key part
length, unset the key part length.
We also unset the key part length if it is the same as the
old field's length, so the whole new field will be used.
BLOBs may have cfield->length == 0, which is why we test it before
checking whether cfield->length < key_part_length (in chars).
In case of TEXTs we check the data type maximum length *in bytes*
to key part length measured *in characters* (i.e. key_part_length
devided to mbmaxlen). This is because it's OK to have:
CREATE TABLE t1 (a tinytext, key(a(254)) character set utf8);
In case of this example:
- data type maximum length is 255.
- key_part_length is 1016 (=254*4, where 4 is mbmaxlen)
*/
if (!Field::type_can_have_key_part(cfield->field->type()) ||
!Field::type_can_have_key_part(cfield->sql_type) ||
/* spatial keys can't have sub-key length */
(key_info->flags & HA_SPATIAL) ||
(cfield->field->field_length == key_part_length &&
!f_is_blob(key_part->key_type)) ||
(cfield->length && (((cfield->sql_type >= MYSQL_TYPE_TINY_BLOB &&
cfield->sql_type <= MYSQL_TYPE_BLOB) ?
blob_length_by_type(cfield->sql_type) :
cfield->length) <
key_part_length / key_part->field->charset()->mbmaxlen)))
key_part_length= 0; // Use whole field
}
key_part_length /= key_part->field->charset()->mbmaxlen;
key_parts.push_back(new Key_part_spec(cfield->field_name,
strlen(cfield->field_name),
key_part_length));
}
if (table->s->tmp_table == NO_TMP_TABLE)
{
if (delete_index_stat)
(void) delete_statistics_for_index(thd, table, key_info, FALSE);
else if (modified_primary_key &&
key_info->user_defined_key_parts != key_info->ext_key_parts)
(void) delete_statistics_for_index(thd, table, key_info, TRUE);
}
if (key_parts.elements)
{
KEY_CREATE_INFO key_create_info;
Key *key;
enum Key::Keytype key_type;
bzero((char*) &key_create_info, sizeof(key_create_info));
key_create_info.algorithm= key_info->algorithm;
if (key_info->flags & HA_USES_BLOCK_SIZE)
key_create_info.block_size= key_info->block_size;
if (key_info->flags & HA_USES_PARSER)
key_create_info.parser_name= *plugin_name(key_info->parser);
if (key_info->flags & HA_USES_COMMENT)
key_create_info.comment= key_info->comment;
/*
We're refreshing an already existing index. Since the index is not
modified, there is no need to check for duplicate indexes again.
*/
key_create_info.check_for_duplicate_indexes= false;
if (key_info->flags & HA_SPATIAL)
key_type= Key::SPATIAL;
else if (key_info->flags & HA_NOSAME)
{
if (! my_strcasecmp(system_charset_info, key_name, primary_key_name))
key_type= Key::PRIMARY;
else
key_type= Key::UNIQUE;
}
else if (key_info->flags & HA_FULLTEXT)
key_type= Key::FULLTEXT;
else
key_type= Key::MULTIPLE;
key= new Key(key_type, key_name, strlen(key_name),
&key_create_info,
MY_TEST(key_info->flags & HA_GENERATED_KEY),
key_parts, key_info->option_list, DDL_options());
new_key_list.push_back(key);
}
}
{
Key *key;
while ((key=key_it++)) // Add new keys
{
if (key->type == Key::FOREIGN_KEY &&
((Foreign_key *)key)->validate(new_create_list))
goto err;
new_key_list.push_back(key);
if (key->name.str &&
!my_strcasecmp(system_charset_info, key->name.str, primary_key_name))
{
my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key->name.str);
goto err;
}
}
}
if (alter_info->drop_list.elements)
{
Alter_drop *drop;
drop_it.rewind();
while ((drop=drop_it++)) {
switch (drop->type) {
case Alter_drop::KEY:
case Alter_drop::COLUMN:
my_error(ER_CANT_DROP_FIELD_OR_KEY, MYF(0),
alter_info->drop_list.head()->name);
goto err;
case Alter_drop::FOREIGN_KEY:
// Leave the DROP FOREIGN KEY names in the alter_info->drop_list.
break;
}
}
}
if (alter_info->alter_list.elements)
{
my_error(ER_CANT_DROP_FIELD_OR_KEY, MYF(0),
alter_info->alter_list.head()->name);
goto err;
}
if (!create_info->comment.str)
{
create_info->comment.str= table->s->comment.str;
create_info->comment.length= table->s->comment.length;
}
table->file->update_create_info(create_info);
if ((create_info->table_options &
(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS)) ||
(used_fields & HA_CREATE_USED_PACK_KEYS))
db_create_options&= ~(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS);
if ((create_info->table_options &
(HA_OPTION_STATS_PERSISTENT | HA_OPTION_NO_STATS_PERSISTENT)) ||
(used_fields & HA_CREATE_USED_STATS_PERSISTENT))
db_create_options&= ~(HA_OPTION_STATS_PERSISTENT | HA_OPTION_NO_STATS_PERSISTENT);
if (create_info->table_options &
(HA_OPTION_CHECKSUM | HA_OPTION_NO_CHECKSUM))
db_create_options&= ~(HA_OPTION_CHECKSUM | HA_OPTION_NO_CHECKSUM);
if (create_info->table_options &
(HA_OPTION_DELAY_KEY_WRITE | HA_OPTION_NO_DELAY_KEY_WRITE))
db_create_options&= ~(HA_OPTION_DELAY_KEY_WRITE |
HA_OPTION_NO_DELAY_KEY_WRITE);
create_info->table_options|= db_create_options;
if (table->s->tmp_table)
create_info->options|=HA_LEX_CREATE_TMP_TABLE;
rc= FALSE;
alter_info->create_list.swap(new_create_list);
alter_info->key_list.swap(new_key_list);
err:
DBUG_RETURN(rc);
}
/**
Get Create_field object for newly created table by its name
in the old version of table.
@param alter_info Alter_info describing newly created table.
@param old_name Name of field in old table.
@returns Pointer to Create_field object, NULL - if field is
not present in new version of table.
*/
static Create_field *get_field_by_old_name(Alter_info *alter_info,
const char *old_name)
{
List_iterator_fast<Create_field> new_field_it(alter_info->create_list);
Create_field *new_field;
while ((new_field= new_field_it++))
{
if (new_field->field &&
(my_strcasecmp(system_charset_info,
new_field->field->field_name,
old_name) == 0))
break;
}
return new_field;
}
/** Type of change to foreign key column, */
enum fk_column_change_type
{
FK_COLUMN_NO_CHANGE, FK_COLUMN_DATA_CHANGE,
FK_COLUMN_RENAMED, FK_COLUMN_DROPPED
};
/**
Check that ALTER TABLE's changes on columns of a foreign key are allowed.
@param[in] thd Thread context.
@param[in] alter_info Alter_info describing changes to be done
by ALTER TABLE.
@param[in] fk_columns List of columns of the foreign key to check.
@param[out] bad_column_name Name of field on which ALTER TABLE tries to
do prohibited operation.
@note This function takes into account value of @@foreign_key_checks
setting.
@retval FK_COLUMN_NO_CHANGE No significant changes are to be done on
foreign key columns.
@retval FK_COLUMN_DATA_CHANGE ALTER TABLE might result in value
change in foreign key column (and
foreign_key_checks is on).
@retval FK_COLUMN_RENAMED Foreign key column is renamed.
@retval FK_COLUMN_DROPPED Foreign key column is dropped.
*/
static enum fk_column_change_type
fk_check_column_changes(THD *thd, Alter_info *alter_info,
List<LEX_STRING> &fk_columns,
const char **bad_column_name)
{
List_iterator_fast<LEX_STRING> column_it(fk_columns);
LEX_STRING *column;
*bad_column_name= NULL;
while ((column= column_it++))
{
Create_field *new_field= get_field_by_old_name(alter_info, column->str);
if (new_field)
{
Field *old_field= new_field->field;
if (my_strcasecmp(system_charset_info, old_field->field_name,
new_field->field_name))
{
/*
Copy algorithm doesn't support proper renaming of columns in
the foreign key yet. At the moment we lack API which will tell
SE that foreign keys should be updated to use new name of column
like it happens in case of in-place algorithm.
*/
*bad_column_name= column->str;
return FK_COLUMN_RENAMED;
}
if ((old_field->is_equal(new_field) == IS_EQUAL_NO) ||
((new_field->flags & NOT_NULL_FLAG) &&
!(old_field->flags & NOT_NULL_FLAG)))
{
if (!(thd->variables.option_bits & OPTION_NO_FOREIGN_KEY_CHECKS))
{
/*
Column in a FK has changed significantly. Unless
foreign_key_checks are off we prohibit this since this
means values in this column might be changed by ALTER
and thus referential integrity might be broken,
*/
*bad_column_name= column->str;
return FK_COLUMN_DATA_CHANGE;
}
}
}
else
{
/*
Column in FK was dropped. Most likely this will break
integrity constraints of InnoDB data-dictionary (and thus
InnoDB will emit an error), so we prohibit this right away
even if foreign_key_checks are off.
This also includes a rare case when another field replaces
field being dropped since it is easy to break referential
integrity in this case.
*/
*bad_column_name= column->str;
return FK_COLUMN_DROPPED;
}
}
return FK_COLUMN_NO_CHANGE;
}
/**
Check if ALTER TABLE we are about to execute using COPY algorithm
is not supported as it might break referential integrity.
@note If foreign_key_checks is disabled (=0), we allow to break
referential integrity. But we still disallow some operations
like dropping or renaming columns in foreign key since they
are likely to break consistency of InnoDB data-dictionary
and thus will end-up in error anyway.
@param[in] thd Thread context.
@param[in] table Table to be altered.
@param[in] alter_info Lists of fields, keys to be changed, added
or dropped.
@param[out] alter_ctx ALTER TABLE runtime context.
Alter_table_ctx::fk_error_if_delete flag
is set if deletion during alter can break
foreign key integrity.
@retval false Success.
@retval true Error, ALTER - tries to do change which is not compatible
with foreign key definitions on the table.
*/
static bool fk_prepare_copy_alter_table(THD *thd, TABLE *table,
Alter_info *alter_info,
Alter_table_ctx *alter_ctx)
{
List <FOREIGN_KEY_INFO> fk_parent_key_list;
List <FOREIGN_KEY_INFO> fk_child_key_list;
FOREIGN_KEY_INFO *f_key;
DBUG_ENTER("fk_prepare_copy_alter_table");
table->file->get_parent_foreign_key_list(thd, &fk_parent_key_list);
/* OOM when building list. */
if (thd->is_error())
DBUG_RETURN(true);
/*
Remove from the list all foreign keys in which table participates as
parent which are to be dropped by this ALTER TABLE. This is possible
when a foreign key has the same table as child and parent.
*/
List_iterator<FOREIGN_KEY_INFO> fk_parent_key_it(fk_parent_key_list);
while ((f_key= fk_parent_key_it++))
{
Alter_drop *drop;
List_iterator_fast<Alter_drop> drop_it(alter_info->drop_list);
while ((drop= drop_it++))
{
/*
InnoDB treats foreign key names in case-insensitive fashion.
So we do it here too. For database and table name type of
comparison used depends on lower-case-table-names setting.
For l_c_t_n = 0 we use case-sensitive comparison, for
l_c_t_n > 0 modes case-insensitive comparison is used.
*/
if ((drop->type == Alter_drop::FOREIGN_KEY) &&
(my_strcasecmp(system_charset_info, f_key->foreign_id->str,
drop->name) == 0) &&
(my_strcasecmp(table_alias_charset, f_key->foreign_db->str,
table->s->db.str) == 0) &&
(my_strcasecmp(table_alias_charset, f_key->foreign_table->str,
table->s->table_name.str) == 0))
fk_parent_key_it.remove();
}
}
/*
If there are FKs in which this table is parent which were not
dropped we need to prevent ALTER deleting rows from the table,
as it might break referential integrity. OTOH it is OK to do
so if foreign_key_checks are disabled.
*/
if (!fk_parent_key_list.is_empty() &&
!(thd->variables.option_bits & OPTION_NO_FOREIGN_KEY_CHECKS))
alter_ctx->set_fk_error_if_delete_row(fk_parent_key_list.head());
fk_parent_key_it.rewind();
while ((f_key= fk_parent_key_it++))
{
enum fk_column_change_type changes;
const char *bad_column_name;
changes= fk_check_column_changes(thd, alter_info,
f_key->referenced_fields,
&bad_column_name);
switch(changes)
{
case FK_COLUMN_NO_CHANGE:
/* No significant changes. We can proceed with ALTER! */
break;
case FK_COLUMN_DATA_CHANGE:
{
char buff[NAME_LEN*2+2];
strxnmov(buff, sizeof(buff)-1, f_key->foreign_db->str, ".",
f_key->foreign_table->str, NullS);
my_error(ER_FK_COLUMN_CANNOT_CHANGE_CHILD, MYF(0), bad_column_name,
f_key->foreign_id->str, buff);
DBUG_RETURN(true);
}
case FK_COLUMN_RENAMED:
my_error(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON, MYF(0),
"ALGORITHM=COPY",
ER(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_FK_RENAME),
"ALGORITHM=INPLACE");
DBUG_RETURN(true);
case FK_COLUMN_DROPPED:
{
char buff[NAME_LEN*2+2];
strxnmov(buff, sizeof(buff)-1, f_key->foreign_db->str, ".",
f_key->foreign_table->str, NullS);
my_error(ER_FK_COLUMN_CANNOT_DROP_CHILD, MYF(0), bad_column_name,
f_key->foreign_id->str, buff);
DBUG_RETURN(true);
}
default:
DBUG_ASSERT(0);
}
}
table->file->get_foreign_key_list(thd, &fk_child_key_list);
/* OOM when building list. */
if (thd->is_error())
DBUG_RETURN(true);
/*
Remove from the list all foreign keys which are to be dropped
by this ALTER TABLE.
*/
List_iterator<FOREIGN_KEY_INFO> fk_key_it(fk_child_key_list);
while ((f_key= fk_key_it++))
{
Alter_drop *drop;
List_iterator_fast<Alter_drop> drop_it(alter_info->drop_list);
while ((drop= drop_it++))
{
/* Names of foreign keys in InnoDB are case-insensitive. */
if ((drop->type == Alter_drop::FOREIGN_KEY) &&
(my_strcasecmp(system_charset_info, f_key->foreign_id->str,
drop->name) == 0))
fk_key_it.remove();
}
}
fk_key_it.rewind();
while ((f_key= fk_key_it++))
{
enum fk_column_change_type changes;
const char *bad_column_name;
changes= fk_check_column_changes(thd, alter_info,
f_key->foreign_fields,
&bad_column_name);
switch(changes)
{
case FK_COLUMN_NO_CHANGE:
/* No significant changes. We can proceed with ALTER! */
break;
case FK_COLUMN_DATA_CHANGE:
my_error(ER_FK_COLUMN_CANNOT_CHANGE, MYF(0), bad_column_name,
f_key->foreign_id->str);
DBUG_RETURN(true);
case FK_COLUMN_RENAMED:
my_error(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON, MYF(0),
"ALGORITHM=COPY",
ER(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_FK_RENAME),
"ALGORITHM=INPLACE");
DBUG_RETURN(true);
case FK_COLUMN_DROPPED:
my_error(ER_FK_COLUMN_CANNOT_DROP, MYF(0), bad_column_name,
f_key->foreign_id->str);
DBUG_RETURN(true);
default:
DBUG_ASSERT(0);
}
}
DBUG_RETURN(false);
}
/**
Rename table and/or turn indexes on/off without touching .FRM
@param thd Thread handler
@param table_list TABLE_LIST for the table to change
@param keys_onoff ENABLE or DISABLE KEYS?
@param alter_ctx ALTER TABLE runtime context.
@return Operation status
@retval false Success
@retval true Failure
*/
static bool
simple_rename_or_index_change(THD *thd, TABLE_LIST *table_list,
Alter_info::enum_enable_or_disable keys_onoff,
Alter_table_ctx *alter_ctx)
{
TABLE *table= table_list->table;
MDL_ticket *mdl_ticket= table->mdl_ticket;
int error= 0;
enum ha_extra_function extra_func= thd->locked_tables_mode
? HA_EXTRA_NOT_USED
: HA_EXTRA_FORCE_REOPEN;
DBUG_ENTER("simple_rename_or_index_change");
if (keys_onoff != Alter_info::LEAVE_AS_IS)
{
if (wait_while_table_is_used(thd, table, extra_func))
DBUG_RETURN(true);
// It's now safe to take the table level lock.
if (lock_tables(thd, table_list, alter_ctx->tables_opened, 0))
DBUG_RETURN(true);
error= alter_table_manage_keys(table,
table->file->indexes_are_disabled(),
keys_onoff);
}
if (!error && alter_ctx->is_table_renamed())
{
THD_STAGE_INFO(thd, stage_rename);
handlerton *old_db_type= table->s->db_type();
/*
Then do a 'simple' rename of the table. First we need to close all
instances of 'source' table.
Note that if wait_while_table_is_used() returns error here (i.e. if
this thread was killed) then it must be that previous step of
simple rename did nothing and therefore we can safely return
without additional clean-up.
*/
if (wait_while_table_is_used(thd, table, extra_func))
DBUG_RETURN(true);
close_all_tables_for_name(thd, table->s, HA_EXTRA_PREPARE_FOR_RENAME, NULL);
LEX_STRING old_db_name= { alter_ctx->db, strlen(alter_ctx->db) };
LEX_STRING old_table_name=
{ alter_ctx->table_name, strlen(alter_ctx->table_name) };
LEX_STRING new_db_name= { alter_ctx->new_db, strlen(alter_ctx->new_db) };
LEX_STRING new_table_name=
{ alter_ctx->new_alias, strlen(alter_ctx->new_alias) };
(void) rename_table_in_stat_tables(thd, &old_db_name, &old_table_name,
&new_db_name, &new_table_name);
if (mysql_rename_table(old_db_type, alter_ctx->db, alter_ctx->table_name,
alter_ctx->new_db, alter_ctx->new_alias, 0))
error= -1;
else if (Table_triggers_list::change_table_name(thd,
alter_ctx->db,
alter_ctx->alias,
alter_ctx->table_name,
alter_ctx->new_db,
alter_ctx->new_alias))
{
(void) mysql_rename_table(old_db_type,
alter_ctx->new_db, alter_ctx->new_alias,
alter_ctx->db, alter_ctx->table_name,
NO_FK_CHECKS);
error= -1;
}
}
if (!error)
{
error= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
if (!error)
my_ok(thd);
}
table_list->table= NULL; // For query cache
query_cache_invalidate3(thd, table_list, 0);
if ((thd->locked_tables_mode == LTM_LOCK_TABLES ||
thd->locked_tables_mode == LTM_PRELOCKED_UNDER_LOCK_TABLES))
{
/*
Under LOCK TABLES we should adjust meta-data locks before finishing
statement. Otherwise we can rely on them being released
along with the implicit commit.
*/
if (alter_ctx->is_table_renamed())
thd->mdl_context.release_all_locks_for_name(mdl_ticket);
else
mdl_ticket->downgrade_lock(MDL_SHARED_NO_READ_WRITE);
}
DBUG_RETURN(error != 0);
}
/**
Alter table
@param thd Thread handle
@param new_db If there is a RENAME clause
@param new_name If there is a RENAME clause
@param create_info Information from the parsing phase about new
table properties.
@param table_list The table to change.
@param alter_info Lists of fields, keys to be changed, added
or dropped.
@param order_num How many ORDER BY fields has been specified.
@param order List of fields to ORDER BY.
@param ignore Whether we have ALTER IGNORE TABLE
@retval true Error
@retval false Success
This is a veery long function and is everything but the kitchen sink :)
It is used to alter a table and not only by ALTER TABLE but also
CREATE|DROP INDEX are mapped on this function.
When the ALTER TABLE statement just does a RENAME or ENABLE|DISABLE KEYS,
or both, then this function short cuts its operation by renaming
the table and/or enabling/disabling the keys. In this case, the FRM is
not changed, directly by mysql_alter_table. However, if there is a
RENAME + change of a field, or an index, the short cut is not used.
See how `create_list` is used to generate the new FRM regarding the
structure of the fields. The same is done for the indices of the table.
Altering a table can be done in two ways. The table can be modified
directly using an in-place algorithm, or the changes can be done using
an intermediate temporary table (copy). In-place is the preferred
algorithm as it avoids copying table data. The storage engine
selects which algorithm to use in check_if_supported_inplace_alter()
based on information about the table changes from fill_alter_inplace_info().
*/
bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
HA_CREATE_INFO *create_info,
TABLE_LIST *table_list,
Alter_info *alter_info,
uint order_num, ORDER *order, bool ignore)
{
DBUG_ENTER("mysql_alter_table");
/*
Check if we attempt to alter mysql.slow_log or
mysql.general_log table and return an error if
it is the case.
TODO: this design is obsolete and will be removed.
*/
int table_kind= check_if_log_table(table_list, FALSE, NullS);
if (table_kind)
{
/* Disable alter of enabled log tables */
if (logger.is_log_table_enabled(table_kind))
{
my_error(ER_BAD_LOG_STATEMENT, MYF(0), "ALTER");
DBUG_RETURN(true);
}
/* Disable alter of log tables to unsupported engine */
if ((create_info->used_fields & HA_CREATE_USED_ENGINE) &&
(!create_info->db_type || /* unknown engine */
!(create_info->db_type->flags & HTON_SUPPORT_LOG_TABLES)))
{
my_error(ER_UNSUPORTED_LOG_ENGINE, MYF(0),
hton_name(create_info->db_type)->str);
DBUG_RETURN(true);
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (alter_info->flags & Alter_info::ALTER_PARTITION)
{
my_error(ER_WRONG_USAGE, MYF(0), "PARTITION", "log table");
DBUG_RETURN(true);
}
#endif
}
THD_STAGE_INFO(thd, stage_init);
/*
Code below can handle only base tables so ensure that we won't open a view.
Note that RENAME TABLE the only ALTER clause which is supported for views
has been already processed.
*/
table_list->required_type= FRMTYPE_TABLE;
Alter_table_prelocking_strategy alter_prelocking_strategy;
DEBUG_SYNC(thd, "alter_table_before_open_tables");
uint tables_opened;
thd->open_options|= HA_OPEN_FOR_ALTER;
bool error= open_tables(thd, &table_list, &tables_opened, 0,
&alter_prelocking_strategy);
thd->open_options&= ~HA_OPEN_FOR_ALTER;
DEBUG_SYNC(thd, "alter_opened_table");
if (error)
DBUG_RETURN(true);
TABLE *table= table_list->table;
table->use_all_columns();
MDL_ticket *mdl_ticket= table->mdl_ticket;
/*
Prohibit changing of the UNION list of a non-temporary MERGE table
under LOCK tables. It would be quite difficult to reuse a shrinked
set of tables from the old table or to open a new TABLE object for
an extended list and verify that they belong to locked tables.
*/
if ((thd->locked_tables_mode == LTM_LOCK_TABLES ||
thd->locked_tables_mode == LTM_PRELOCKED_UNDER_LOCK_TABLES) &&
(create_info->used_fields & HA_CREATE_USED_UNION) &&
(table->s->tmp_table == NO_TMP_TABLE))
{
my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
DBUG_RETURN(true);
}
Alter_table_ctx alter_ctx(thd, table_list, tables_opened, new_db, new_name);
MDL_request target_mdl_request;
/* Check that we are not trying to rename to an existing table */
if (alter_ctx.is_table_renamed())
{
if (table->s->tmp_table != NO_TMP_TABLE)
{
if (find_temporary_table(thd, alter_ctx.new_db, alter_ctx.new_name))
{
my_error(ER_TABLE_EXISTS_ERROR, MYF(0), alter_ctx.new_alias);
DBUG_RETURN(true);
}
}
else
{
MDL_request_list mdl_requests;
MDL_request target_db_mdl_request;
target_mdl_request.init(MDL_key::TABLE,
alter_ctx.new_db, alter_ctx.new_name,
MDL_EXCLUSIVE, MDL_TRANSACTION);
mdl_requests.push_front(&target_mdl_request);
/*
If we are moving the table to a different database, we also
need IX lock on the database name so that the target database
is protected by MDL while the table is moved.
*/
if (alter_ctx.is_database_changed())
{
target_db_mdl_request.init(MDL_key::SCHEMA, alter_ctx.new_db, "",
MDL_INTENTION_EXCLUSIVE,
MDL_TRANSACTION);
mdl_requests.push_front(&target_db_mdl_request);
}
/*
Global intention exclusive lock must have been already acquired when
table to be altered was open, so there is no need to do it here.
*/
DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::GLOBAL,
"", "",
MDL_INTENTION_EXCLUSIVE));
if (thd->mdl_context.acquire_locks(&mdl_requests,
thd->variables.lock_wait_timeout))
DBUG_RETURN(true);
DEBUG_SYNC(thd, "locked_table_name");
/*
Table maybe does not exist, but we got an exclusive lock
on the name, now we can safely try to find out for sure.
*/
if (ha_table_exists(thd, alter_ctx.new_db, alter_ctx.new_name, 0))
{
/* Table will be closed in do_command() */
my_error(ER_TABLE_EXISTS_ERROR, MYF(0), alter_ctx.new_alias);
DBUG_RETURN(true);
}
}
}
if (!create_info->db_type)
{
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (table->part_info &&
create_info->used_fields & HA_CREATE_USED_ENGINE)
{
/*
This case happens when the user specified
ENGINE = x where x is a non-existing storage engine
We set create_info->db_type to default_engine_type
to ensure we don't change underlying engine type
due to a erroneously given engine name.
*/
create_info->db_type= table->part_info->default_engine_type;
}
else
#endif
create_info->db_type= table->s->db_type();
}
if (check_engine(thd, alter_ctx.new_db, alter_ctx.new_name, create_info))
DBUG_RETURN(true);
if ((create_info->db_type != table->s->db_type() ||
alter_info->flags & Alter_info::ALTER_PARTITION) &&
!table->file->can_switch_engines())
{
my_error(ER_ROW_IS_REFERENCED, MYF(0));
DBUG_RETURN(true);
}
/*
If foreign key is added then check permission to access parent table.
In function "check_fk_parent_table_access", create_info->db_type is used
to identify whether engine supports FK constraint or not. Since
create_info->db_type is set here, check to parent table access is delayed
till this point for the alter operation.
*/
if ((alter_info->flags & Alter_info::ADD_FOREIGN_KEY) &&
check_fk_parent_table_access(thd, create_info, alter_info))
DBUG_RETURN(true);
/*
If this is an ALTER TABLE and no explicit row type specified reuse
the table's row type.
Note: this is the same as if the row type was specified explicitly.
*/
if (create_info->row_type == ROW_TYPE_NOT_USED)
{
/* ALTER TABLE without explicit row type */
create_info->row_type= table->s->row_type;
}
else
{
/* ALTER TABLE with specific row type */
create_info->used_fields |= HA_CREATE_USED_ROW_FORMAT;
}
DBUG_PRINT("info", ("old type: %s new type: %s",
ha_resolve_storage_engine_name(table->s->db_type()),
ha_resolve_storage_engine_name(create_info->db_type)));
if (ha_check_storage_engine_flag(table->s->db_type(), HTON_ALTER_NOT_SUPPORTED))
{
DBUG_PRINT("info", ("doesn't support alter"));
my_error(ER_ILLEGAL_HA, MYF(0), hton_name(table->s->db_type())->str,
alter_ctx.db, alter_ctx.table_name);
DBUG_RETURN(true);
}
if (ha_check_storage_engine_flag(create_info->db_type,
HTON_ALTER_NOT_SUPPORTED))
{
DBUG_PRINT("info", ("doesn't support alter"));
my_error(ER_ILLEGAL_HA, MYF(0), hton_name(create_info->db_type)->str,
alter_ctx.new_db, alter_ctx.new_name);
DBUG_RETURN(true);
}
if (table->s->tmp_table == NO_TMP_TABLE)
mysql_audit_alter_table(thd, table_list);
THD_STAGE_INFO(thd, stage_setup);
if (!(alter_info->flags & ~(Alter_info::ALTER_RENAME |
Alter_info::ALTER_KEYS_ONOFF)) &&
alter_info->requested_algorithm !=
Alter_info::ALTER_TABLE_ALGORITHM_COPY &&
!table->s->tmp_table) // no need to touch frm
{
// This requires X-lock, no other lock levels supported.
if (alter_info->requested_lock != Alter_info::ALTER_TABLE_LOCK_DEFAULT &&
alter_info->requested_lock != Alter_info::ALTER_TABLE_LOCK_EXCLUSIVE)
{
my_error(ER_ALTER_OPERATION_NOT_SUPPORTED, MYF(0),
"LOCK=NONE/SHARED", "LOCK=EXCLUSIVE");
DBUG_RETURN(true);
}
bool res= simple_rename_or_index_change(thd, table_list,
alter_info->keys_onoff,
&alter_ctx);
DBUG_RETURN(res);
}
handle_if_exists_options(thd, table, alter_info);
/*
Look if we have to do anything at all.
Normally ALTER can become NOOP only after handling
the IF (NOT) EXISTS options.
*/
if (alter_info->flags == 0)
{
my_snprintf(alter_ctx.tmp_name, sizeof(alter_ctx.tmp_name),
ER(ER_INSERT_INFO), 0L, 0L,
thd->get_stmt_da()->current_statement_warn_count());
my_ok(thd, 0L, 0L, alter_ctx.tmp_name);
DBUG_RETURN(false);
}
/* We have to do full alter table. */
#ifdef WITH_PARTITION_STORAGE_ENGINE
bool partition_changed= false;
bool fast_alter_partition= false;
{
if (prep_alter_part_table(thd, table, alter_info, create_info,
&alter_ctx, &partition_changed,
&fast_alter_partition))
{
DBUG_RETURN(true);
}
}
#endif
if (mysql_prepare_alter_table(thd, table, create_info, alter_info,
&alter_ctx))
{
DBUG_RETURN(true);
}
set_table_default_charset(thd, create_info, alter_ctx.db);
promote_first_timestamp_column(&alter_info->create_list);
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (fast_alter_partition)
{
/*
ALGORITHM and LOCK clauses are generally not allowed by the
parser for operations related to partitioning.
The exceptions are ALTER_PARTITION and ALTER_REMOVE_PARTITIONING.
For consistency, we report ER_ALTER_OPERATION_NOT_SUPPORTED here.
*/
if (alter_info->requested_lock !=
Alter_info::ALTER_TABLE_LOCK_DEFAULT)
{
my_error(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON, MYF(0),
"LOCK=NONE/SHARED/EXCLUSIVE",
ER(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_PARTITION),
"LOCK=DEFAULT");
DBUG_RETURN(true);
}
else if (alter_info->requested_algorithm !=
Alter_info::ALTER_TABLE_ALGORITHM_DEFAULT)
{
my_error(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON, MYF(0),
"ALGORITHM=COPY/INPLACE",
ER(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_PARTITION),
"ALGORITHM=DEFAULT");
DBUG_RETURN(true);
}
/*
Upgrade from MDL_SHARED_UPGRADABLE to MDL_SHARED_NO_WRITE.
Afterwards it's safe to take the table level lock.
*/
if (thd->mdl_context.upgrade_shared_lock(mdl_ticket, MDL_SHARED_NO_WRITE,
thd->variables.lock_wait_timeout)
|| lock_tables(thd, table_list, alter_ctx.tables_opened, 0))
{
DBUG_RETURN(true);
}
// In-place execution of ALTER TABLE for partitioning.
DBUG_RETURN(fast_alter_partition_table(thd, table, alter_info,
create_info, table_list,
alter_ctx.db,
alter_ctx.table_name));
}
#endif
/*
Use copy algorithm if:
- old_alter_table system variable is set without in-place requested using
the ALGORITHM clause.
- Or if in-place is impossible for given operation.
- Changes to partitioning which were not handled by fast_alter_part_table()
needs to be handled using table copying algorithm unless the engine
supports auto-partitioning as such engines can do some changes
using in-place API.
*/
if ((thd->variables.old_alter_table &&
alter_info->requested_algorithm !=
Alter_info::ALTER_TABLE_ALGORITHM_INPLACE)
|| is_inplace_alter_impossible(table, create_info, alter_info)
#ifdef WITH_PARTITION_STORAGE_ENGINE
|| (partition_changed &&
!(table->s->db_type()->partition_flags() & HA_USE_AUTO_PARTITION))
#endif
)
{
if (alter_info->requested_algorithm ==
Alter_info::ALTER_TABLE_ALGORITHM_INPLACE)
{
my_error(ER_ALTER_OPERATION_NOT_SUPPORTED, MYF(0),
"ALGORITHM=INPLACE", "ALGORITHM=COPY");
DBUG_RETURN(true);
}
alter_info->requested_algorithm= Alter_info::ALTER_TABLE_ALGORITHM_COPY;
}
/*
ALTER TABLE ... ENGINE to the same engine is a common way to
request table rebuild. Set ALTER_RECREATE flag to force table
rebuild.
*/
if (create_info->db_type == table->s->db_type() &&
create_info->used_fields & HA_CREATE_USED_ENGINE)
alter_info->flags|= Alter_info::ALTER_RECREATE;
/*
If the old table had partitions and we are doing ALTER TABLE ...
engine= <new_engine>, the new table must preserve the original
partitioning. This means that the new engine is still the
partitioning engine, not the engine specified in the parser.
This is discovered in prep_alter_part_table, which in such case
updates create_info->db_type.
It's therefore important that the assignment below is done
after prep_alter_part_table.
*/
handlerton *new_db_type= create_info->db_type;
handlerton *old_db_type= table->s->db_type();
TABLE *new_table= NULL;
ha_rows copied=0,deleted=0;
/*
Handling of symlinked tables:
If no rename:
Create new data file and index file on the same disk as the
old data and index files.
Copy data.
Rename new data file over old data file and new index file over
old index file.
Symlinks are not changed.
If rename:
Create new data file and index file on the same disk as the
old data and index files. Create also symlinks to point at
the new tables.
Copy data.
At end, rename intermediate tables, and symlinks to intermediate
table, to final table name.
Remove old table and old symlinks
If rename is made to another database:
Create new tables in new database.
Copy data.
Remove old table and symlinks.
*/
char index_file[FN_REFLEN], data_file[FN_REFLEN];
if (!alter_ctx.is_database_changed())
{
if (create_info->index_file_name)
{
/* Fix index_file_name to have 'tmp_name' as basename */
strmov(index_file, alter_ctx.tmp_name);
create_info->index_file_name=fn_same(index_file,
create_info->index_file_name,
1);
}
if (create_info->data_file_name)
{
/* Fix data_file_name to have 'tmp_name' as basename */
strmov(data_file, alter_ctx.tmp_name);
create_info->data_file_name=fn_same(data_file,
create_info->data_file_name,
1);
}
}
else
{
/* Ignore symlink if db is changed. */
create_info->data_file_name=create_info->index_file_name=0;
}
DEBUG_SYNC(thd, "alter_table_before_create_table_no_lock");
/* We can abort alter table for any table type */
thd->abort_on_warning= !ignore && thd->is_strict_mode();
/*
Create .FRM for new version of table with a temporary name.
We don't log the statement, it will be logged later.
Keep information about keys in newly created table as it
will be used later to construct Alter_inplace_info object
and by fill_alter_inplace_info() call.
*/
KEY *key_info;
uint key_count;
/*
Remember if the new definition has new VARCHAR column;
create_info->varchar will be reset in create_table_impl()/
mysql_prepare_create_table().
*/
bool varchar= create_info->varchar;
LEX_CUSTRING frm= {0,0};
tmp_disable_binlog(thd);
create_info->options|=HA_CREATE_TMP_ALTER;
error= create_table_impl(thd,
alter_ctx.db, alter_ctx.table_name,
alter_ctx.new_db, alter_ctx.tmp_name,
alter_ctx.get_tmp_path(),
thd->lex->create_info, create_info, alter_info,
C_ALTER_TABLE_FRM_ONLY, NULL,
&key_info, &key_count, &frm);
reenable_binlog(thd);
thd->abort_on_warning= false;
if (error)
{
my_free(const_cast<uchar*>(frm.str));
DBUG_RETURN(true);
}
/* Remember that we have not created table in storage engine yet. */
bool no_ha_table= true;
if (alter_info->requested_algorithm != Alter_info::ALTER_TABLE_ALGORITHM_COPY)
{
Alter_inplace_info ha_alter_info(create_info, alter_info,
key_info, key_count,
IF_PARTITIONING(thd->work_part_info, NULL),
ignore);
TABLE *altered_table= NULL;
bool use_inplace= true;
/* Fill the Alter_inplace_info structure. */
if (fill_alter_inplace_info(thd, table, varchar, &ha_alter_info))
goto err_new_table_cleanup;
if (ha_alter_info.handler_flags == 0)
{
/*
No-op ALTER, no need to call handler API functions.
If this code path is entered for an ALTER statement that
should not be a real no-op, new handler flags should be added
and fill_alter_inplace_info() adjusted.
Note that we can end up here if an ALTER statement has clauses
that cancel each other out (e.g. ADD/DROP identically index).
Also note that we ignore the LOCK clause here.
TODO don't create the frm in the first place
*/
deletefrm(alter_ctx.get_tmp_path());
my_free(const_cast<uchar*>(frm.str));
goto end_inplace;
}
// We assume that the table is non-temporary.
DBUG_ASSERT(!table->s->tmp_table);
if (!(altered_table= open_table_uncached(thd, new_db_type, &frm,
alter_ctx.get_tmp_path(),
alter_ctx.new_db,
alter_ctx.tmp_name,
true, false)))
goto err_new_table_cleanup;
/* Set markers for fields in TABLE object for altered table. */
update_altered_table(ha_alter_info, altered_table);
/*
Mark all columns in 'altered_table' as used to allow usage
of its record[0] buffer and Field objects during in-place
ALTER TABLE.
*/
altered_table->column_bitmaps_set_no_signal(&altered_table->s->all_set,
&altered_table->s->all_set);
restore_record(altered_table, s->default_values); // Create empty record
if (altered_table->default_field && altered_table->update_default_fields())
goto err_new_table_cleanup;
// Ask storage engine whether to use copy or in-place
enum_alter_inplace_result inplace_supported=
table->file->check_if_supported_inplace_alter(altered_table,
&ha_alter_info);
switch (inplace_supported) {
case HA_ALTER_INPLACE_EXCLUSIVE_LOCK:
// If SHARED lock and no particular algorithm was requested, use COPY.
if (alter_info->requested_lock ==
Alter_info::ALTER_TABLE_LOCK_SHARED &&
alter_info->requested_algorithm ==
Alter_info::ALTER_TABLE_ALGORITHM_DEFAULT)
{
use_inplace= false;
}
// Otherwise, if weaker lock was requested, report errror.
else if (alter_info->requested_lock ==
Alter_info::ALTER_TABLE_LOCK_NONE ||
alter_info->requested_lock ==
Alter_info::ALTER_TABLE_LOCK_SHARED)
{
ha_alter_info.report_unsupported_error("LOCK=NONE/SHARED",
"LOCK=EXCLUSIVE");
close_temporary_table(thd, altered_table, true, false);
goto err_new_table_cleanup;
}
break;
case HA_ALTER_INPLACE_SHARED_LOCK_AFTER_PREPARE:
case HA_ALTER_INPLACE_SHARED_LOCK:
// If weaker lock was requested, report errror.
if (alter_info->requested_lock ==
Alter_info::ALTER_TABLE_LOCK_NONE)
{
ha_alter_info.report_unsupported_error("LOCK=NONE", "LOCK=SHARED");
close_temporary_table(thd, altered_table, true, false);
goto err_new_table_cleanup;
}
break;
case HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE:
case HA_ALTER_INPLACE_NO_LOCK:
break;
case HA_ALTER_INPLACE_NOT_SUPPORTED:
// If INPLACE was requested, report error.
if (alter_info->requested_algorithm ==
Alter_info::ALTER_TABLE_ALGORITHM_INPLACE)
{
ha_alter_info.report_unsupported_error("ALGORITHM=INPLACE",
"ALGORITHM=COPY");
close_temporary_table(thd, altered_table, true, false);
goto err_new_table_cleanup;
}
// COPY with LOCK=NONE is not supported, no point in trying.
if (alter_info->requested_lock ==
Alter_info::ALTER_TABLE_LOCK_NONE)
{
ha_alter_info.report_unsupported_error("LOCK=NONE", "LOCK=SHARED");
close_temporary_table(thd, altered_table, true, false);
goto err_new_table_cleanup;
}
// Otherwise use COPY
use_inplace= false;
break;
case HA_ALTER_ERROR:
default:
close_temporary_table(thd, altered_table, true, false);
goto err_new_table_cleanup;
}
if (use_inplace)
{
table->s->frm_image= &frm;
int res= mysql_inplace_alter_table(thd, table_list, table, altered_table,
&ha_alter_info, inplace_supported,
&target_mdl_request, &alter_ctx);
my_free(const_cast<uchar*>(frm.str));
if (res)
DBUG_RETURN(true);
goto end_inplace;
}
else
{
close_temporary_table(thd, altered_table, true, false);
}
}
/* ALTER TABLE using copy algorithm. */
/* Check if ALTER TABLE is compatible with foreign key definitions. */
if (fk_prepare_copy_alter_table(thd, table, alter_info, &alter_ctx))
goto err_new_table_cleanup;
if (!table->s->tmp_table)
{
// COPY algorithm doesn't work with concurrent writes.
if (alter_info->requested_lock == Alter_info::ALTER_TABLE_LOCK_NONE)
{
my_error(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON, MYF(0),
"LOCK=NONE",
ER(ER_ALTER_OPERATION_NOT_SUPPORTED_REASON_COPY),
"LOCK=SHARED");
goto err_new_table_cleanup;
}
// If EXCLUSIVE lock is requested, upgrade already.
if (alter_info->requested_lock == Alter_info::ALTER_TABLE_LOCK_EXCLUSIVE &&
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
goto err_new_table_cleanup;
/*
Otherwise upgrade to SHARED_NO_WRITE.
Note that under LOCK TABLES, we will already have SHARED_NO_READ_WRITE.
*/
if (alter_info->requested_lock != Alter_info::ALTER_TABLE_LOCK_EXCLUSIVE &&
thd->mdl_context.upgrade_shared_lock(mdl_ticket, MDL_SHARED_NO_WRITE,
thd->variables.lock_wait_timeout))
goto err_new_table_cleanup;
DEBUG_SYNC(thd, "alter_table_copy_after_lock_upgrade");
}
// It's now safe to take the table level lock.
if (lock_tables(thd, table_list, alter_ctx.tables_opened, 0))
goto err_new_table_cleanup;
if (ha_create_table(thd, alter_ctx.get_tmp_path(),
alter_ctx.new_db, alter_ctx.tmp_name,
create_info, &frm))
goto err_new_table_cleanup;
/* Mark that we have created table in storage engine. */
no_ha_table= false;
if (create_info->tmp_table())
{
if (!open_table_uncached(thd, new_db_type, &frm,
alter_ctx.get_tmp_path(),
alter_ctx.new_db, alter_ctx.tmp_name,
true, true))
goto err_new_table_cleanup;
}
/* Open the table since we need to copy the data. */
if (table->s->tmp_table != NO_TMP_TABLE)
{
TABLE_LIST tbl;
tbl.init_one_table(alter_ctx.new_db, strlen(alter_ctx.new_db),
alter_ctx.tmp_name, strlen(alter_ctx.tmp_name),
alter_ctx.tmp_name, TL_READ_NO_INSERT);
/* Table is in thd->temporary_tables */
(void) open_temporary_table(thd, &tbl);
new_table= tbl.table;
}
else
{
/* table is a normal table: Create temporary table in same directory */
/* Open our intermediate table. */
new_table= open_table_uncached(thd, new_db_type, &frm,
alter_ctx.get_tmp_path(),
alter_ctx.new_db, alter_ctx.tmp_name,
true, true);
}
if (!new_table)
goto err_new_table_cleanup;
/*
Note: In case of MERGE table, we do not attach children. We do not
copy data for MERGE tables. Only the children have data.
*/
/* Copy the data if necessary. */
thd->count_cuted_fields= CHECK_FIELD_WARN; // calc cuted fields
thd->cuted_fields=0L;
/*
We do not copy data for MERGE tables. Only the children have data.
MERGE tables have HA_NO_COPY_ON_ALTER set.
*/
if (!(new_table->file->ha_table_flags() & HA_NO_COPY_ON_ALTER))
{
new_table->next_number_field=new_table->found_next_number_field;
THD_STAGE_INFO(thd, stage_copy_to_tmp_table);
DBUG_EXECUTE_IF("abort_copy_table", {
my_error(ER_LOCK_WAIT_TIMEOUT, MYF(0));
goto err_new_table_cleanup;
});
if (copy_data_between_tables(thd, table, new_table,
alter_info->create_list, ignore,
order_num, order, &copied, &deleted,
alter_info->keys_onoff,
&alter_ctx))
goto err_new_table_cleanup;
}
else
{
if (!table->s->tmp_table &&
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
goto err_new_table_cleanup;
THD_STAGE_INFO(thd, stage_manage_keys);
alter_table_manage_keys(table, table->file->indexes_are_disabled(),
alter_info->keys_onoff);
if (trans_commit_stmt(thd) || trans_commit_implicit(thd))
goto err_new_table_cleanup;
}
thd->count_cuted_fields= CHECK_FIELD_IGNORE;
if (table->s->tmp_table != NO_TMP_TABLE)
{
/* Close lock if this is a transactional table */
if (thd->lock)
{
if (thd->locked_tables_mode != LTM_LOCK_TABLES &&
thd->locked_tables_mode != LTM_PRELOCKED_UNDER_LOCK_TABLES)
{
mysql_unlock_tables(thd, thd->lock);
thd->lock= NULL;
}
else
{
/*
If LOCK TABLES list is not empty and contains this table,
unlock the table and remove the table from this list.
*/
mysql_lock_remove(thd, thd->lock, table);
}
}
new_table->s->table_creation_was_logged=
table->s->table_creation_was_logged;
/* Remove link to old table and rename the new one */
close_temporary_table(thd, table, true, true);
/* Should pass the 'new_name' as we store table name in the cache */
if (rename_temporary_table(thd, new_table,
alter_ctx.new_db, alter_ctx.new_name))
goto err_new_table_cleanup;
/* We don't replicate alter table statement on temporary tables */
if (!thd->is_current_stmt_binlog_format_row() &&
write_bin_log(thd, true, thd->query(), thd->query_length()))
DBUG_RETURN(true);
my_free(const_cast<uchar*>(frm.str));
goto end_temporary;
}
/*
Close the intermediate table that will be the new table, but do
not delete it! Even altough MERGE tables do not have their children
attached here it is safe to call close_temporary_table().
*/
close_temporary_table(thd, new_table, true, false);
new_table= NULL;
DEBUG_SYNC(thd, "alter_table_before_rename_result_table");
/*
Data is copied. Now we:
1) Wait until all other threads will stop using old version of table
by upgrading shared metadata lock to exclusive one.
2) Close instances of table open by this thread and replace them
with placeholders to simplify reopen process.
3) Rename the old table to a temp name, rename the new one to the
old name.
4) If we are under LOCK TABLES and don't do ALTER TABLE ... RENAME
we reopen new version of table.
5) Write statement to the binary log.
6) If we are under LOCK TABLES and do ALTER TABLE ... RENAME we
remove placeholders and release metadata locks.
7) If we are not not under LOCK TABLES we rely on the caller
(mysql_execute_command()) to release metadata locks.
*/
THD_STAGE_INFO(thd, stage_rename_result_table);
if (wait_while_table_is_used(thd, table, HA_EXTRA_PREPARE_FOR_RENAME))
goto err_new_table_cleanup;
close_all_tables_for_name(thd, table->s,
alter_ctx.is_table_renamed() ?
HA_EXTRA_PREPARE_FOR_RENAME:
HA_EXTRA_NOT_USED,
NULL);
table_list->table= table= NULL; /* Safety */
my_free(const_cast<uchar*>(frm.str));
/*
Rename the old table to temporary name to have a backup in case
anything goes wrong while renaming the new table.
*/
char backup_name[32];
my_snprintf(backup_name, sizeof(backup_name), "%s2-%lx-%lx", tmp_file_prefix,
current_pid, thd->thread_id);
if (lower_case_table_names)
my_casedn_str(files_charset_info, backup_name);
if (mysql_rename_table(old_db_type, alter_ctx.db, alter_ctx.table_name,
alter_ctx.db, backup_name, FN_TO_IS_TMP))
{
// Rename to temporary name failed, delete the new table, abort ALTER.
(void) quick_rm_table(thd, new_db_type, alter_ctx.new_db,
alter_ctx.tmp_name, FN_IS_TMP);
goto err_with_mdl;
}
// Rename the new table to the correct name.
if (mysql_rename_table(new_db_type, alter_ctx.new_db, alter_ctx.tmp_name,
alter_ctx.new_db, alter_ctx.new_alias,
FN_FROM_IS_TMP))
{
// Rename failed, delete the temporary table.
(void) quick_rm_table(thd, new_db_type, alter_ctx.new_db,
alter_ctx.tmp_name, FN_IS_TMP);
// Restore the backup of the original table to the old name.
(void) mysql_rename_table(old_db_type, alter_ctx.db, backup_name,
alter_ctx.db, alter_ctx.alias,
FN_FROM_IS_TMP | NO_FK_CHECKS);
goto err_with_mdl;
}
// Check if we renamed the table and if so update trigger files.
if (alter_ctx.is_table_renamed())
{
if (Table_triggers_list::change_table_name(thd,
alter_ctx.db,
alter_ctx.alias,
alter_ctx.table_name,
alter_ctx.new_db,
alter_ctx.new_alias))
{
// Rename succeeded, delete the new table.
(void) quick_rm_table(thd, new_db_type,
alter_ctx.new_db, alter_ctx.new_alias, 0);
// Restore the backup of the original table to the old name.
(void) mysql_rename_table(old_db_type, alter_ctx.db, backup_name,
alter_ctx.db, alter_ctx.alias,
FN_FROM_IS_TMP | NO_FK_CHECKS);
goto err_with_mdl;
}
rename_table_in_stat_tables(thd, alter_ctx.db,alter_ctx.alias,
alter_ctx.new_db, alter_ctx.new_alias);
}
// ALTER TABLE succeeded, delete the backup of the old table.
if (quick_rm_table(thd, old_db_type, alter_ctx.db, backup_name, FN_IS_TMP))
{
/*
The fact that deletion of the backup failed is not critical
error, but still worth reporting as it might indicate serious
problem with server.
*/
goto err_with_mdl;
}
end_inplace:
if (thd->locked_tables_list.reopen_tables(thd))
goto err_with_mdl;
THD_STAGE_INFO(thd, stage_end);
DEBUG_SYNC(thd, "alter_table_before_main_binlog");
DBUG_ASSERT(!(mysql_bin_log.is_open() &&
thd->is_current_stmt_binlog_format_row() &&
(create_info->tmp_table())));
if (write_bin_log(thd, true, thd->query(), thd->query_length()))
DBUG_RETURN(true);
table_list->table= NULL; // For query cache
query_cache_invalidate3(thd, table_list, false);
if (thd->locked_tables_mode == LTM_LOCK_TABLES ||
thd->locked_tables_mode == LTM_PRELOCKED_UNDER_LOCK_TABLES)
{
if (alter_ctx.is_table_renamed())
thd->mdl_context.release_all_locks_for_name(mdl_ticket);
else
mdl_ticket->downgrade_lock(MDL_SHARED_NO_READ_WRITE);
}
end_temporary:
my_snprintf(alter_ctx.tmp_name, sizeof(alter_ctx.tmp_name),
ER(ER_INSERT_INFO),
(ulong) (copied + deleted), (ulong) deleted,
(ulong) thd->get_stmt_da()->current_statement_warn_count());
my_ok(thd, copied + deleted, 0L, alter_ctx.tmp_name);
DBUG_RETURN(false);
err_new_table_cleanup:
my_free(const_cast<uchar*>(frm.str));
if (new_table)
{
/* close_temporary_table() frees the new_table pointer. */
close_temporary_table(thd, new_table, true, true);
}
else
(void) quick_rm_table(thd, new_db_type,
alter_ctx.new_db, alter_ctx.tmp_name,
(FN_IS_TMP | (no_ha_table ? NO_HA_TABLE : 0)));
/*
No default value was provided for a DATE/DATETIME field, the
current sql_mode doesn't allow the '0000-00-00' value and
the table to be altered isn't empty.
Report error here.
*/
if (alter_ctx.error_if_not_empty &&
thd->get_stmt_da()->current_row_for_warning())
{
const char *f_val= 0;
enum enum_mysql_timestamp_type t_type= MYSQL_TIMESTAMP_DATE;
switch (alter_ctx.datetime_field->sql_type)
{
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_NEWDATE:
f_val= "0000-00-00";
t_type= MYSQL_TIMESTAMP_DATE;
break;
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_DATETIME2:
f_val= "0000-00-00 00:00:00";
t_type= MYSQL_TIMESTAMP_DATETIME;
break;
default:
/* Shouldn't get here. */
DBUG_ASSERT(0);
}
bool save_abort_on_warning= thd->abort_on_warning;
thd->abort_on_warning= true;
make_truncated_value_warning(thd, Sql_condition::WARN_LEVEL_WARN,
f_val, strlength(f_val), t_type,
alter_ctx.datetime_field->field_name);
thd->abort_on_warning= save_abort_on_warning;
}
DBUG_RETURN(true);
err_with_mdl:
/*
An error happened while we were holding exclusive name metadata lock
on table being altered. To be safe under LOCK TABLES we should
remove all references to the altered table from the list of locked
tables and release the exclusive metadata lock.
*/
thd->locked_tables_list.unlink_all_closed_tables(thd, NULL, 0);
thd->mdl_context.release_all_locks_for_name(mdl_ticket);
DBUG_RETURN(true);
}
/**
Prepare the transaction for the alter table's copy phase.
*/
bool mysql_trans_prepare_alter_copy_data(THD *thd)
{
DBUG_ENTER("mysql_trans_prepare_alter_copy_data");
/*
Turn off recovery logging since rollback of an alter table is to
delete the new table so there is no need to log the changes to it.
This needs to be done before external_lock.
*/
if (ha_enable_transaction(thd, FALSE))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
/**
Commit the copy phase of the alter table.
*/
bool mysql_trans_commit_alter_copy_data(THD *thd)
{
bool error= FALSE;
DBUG_ENTER("mysql_trans_commit_alter_copy_data");
if (ha_enable_transaction(thd, TRUE))
DBUG_RETURN(TRUE);
/*
Ensure that the new table is saved properly to disk before installing
the new .frm.
And that InnoDB's internal latches are released, to avoid deadlock
when waiting on other instances of the table before rename (Bug#54747).
*/
if (trans_commit_stmt(thd))
error= TRUE;
if (trans_commit_implicit(thd))
error= TRUE;
DBUG_RETURN(error);
}
static int
copy_data_between_tables(THD *thd, TABLE *from, TABLE *to,
List<Create_field> &create, bool ignore,
uint order_num, ORDER *order,
ha_rows *copied, ha_rows *deleted,
Alter_info::enum_enable_or_disable keys_onoff,
Alter_table_ctx *alter_ctx)
{
int error= 1;
Copy_field *copy= NULL, *copy_end;
ha_rows found_count= 0, delete_count= 0;
uint length= 0;
SORT_FIELD *sortorder;
READ_RECORD info;
TABLE_LIST tables;
List<Item> fields;
List<Item> all_fields;
ha_rows examined_rows;
ha_rows found_rows;
bool auto_increment_field_copied= 0;
ulonglong save_sql_mode= thd->variables.sql_mode;
ulonglong prev_insert_id, time_to_report_progress;
Field **dfield_ptr= to->default_field;
DBUG_ENTER("copy_data_between_tables");
/* Two or 3 stages; Sorting, copying data and update indexes */
thd_progress_init(thd, 2 + MY_TEST(order));
if (mysql_trans_prepare_alter_copy_data(thd))
DBUG_RETURN(-1);
if (!(copy= new Copy_field[to->s->fields]))
DBUG_RETURN(-1); /* purecov: inspected */
/* We need external lock before we can disable/enable keys */
if (to->file->ha_external_lock(thd, F_WRLCK))
DBUG_RETURN(-1);
alter_table_manage_keys(to, from->file->indexes_are_disabled(), keys_onoff);
/* We can abort alter table for any table type */
thd->abort_on_warning= !ignore && thd->is_strict_mode();
from->file->info(HA_STATUS_VARIABLE);
to->file->ha_start_bulk_insert(from->file->stats.records,
ignore ? 0 : HA_CREATE_UNIQUE_INDEX_BY_SORT);
List_iterator<Create_field> it(create);
Create_field *def;
copy_end=copy;
to->s->default_fields= 0;
for (Field **ptr=to->field ; *ptr ; ptr++)
{
def=it++;
if (def->field)
{
if (*ptr == to->next_number_field)
{
auto_increment_field_copied= TRUE;
/*
If we are going to copy contents of one auto_increment column to
another auto_increment column it is sensible to preserve zeroes.
This condition also covers case when we are don't actually alter
auto_increment column.
*/
if (def->field == from->found_next_number_field)
thd->variables.sql_mode|= MODE_NO_AUTO_VALUE_ON_ZERO;
}
(copy_end++)->set(*ptr,def->field,0);
}
else
{
/*
Update the set of auto-update fields to contain only the new fields
added to the table. Only these fields should be updated automatically.
Old fields keep their current values, and therefore should not be
present in the set of autoupdate fields.
*/
if ((*ptr)->has_insert_default_function())
{
*(dfield_ptr++)= *ptr;
++to->s->default_fields;
}
}
}
if (dfield_ptr)
*dfield_ptr= NULL;
if (order)
{
if (to->s->primary_key != MAX_KEY &&
to->file->ha_table_flags() & HA_TABLE_SCAN_ON_INDEX)
{
char warn_buff[MYSQL_ERRMSG_SIZE];
my_snprintf(warn_buff, sizeof(warn_buff),
"ORDER BY ignored as there is a user-defined clustered index"
" in the table '%-.192s'", from->s->table_name.str);
push_warning(thd, Sql_condition::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
warn_buff);
}
else
{
from->sort.io_cache=(IO_CACHE*) my_malloc(sizeof(IO_CACHE),
MYF(MY_FAE | MY_ZEROFILL |
MY_THREAD_SPECIFIC));
bzero((char *) &tables, sizeof(tables));
tables.table= from;
tables.alias= tables.table_name= from->s->table_name.str;
tables.db= from->s->db.str;
THD_STAGE_INFO(thd, stage_sorting);
if (thd->lex->select_lex.setup_ref_array(thd, order_num) ||
setup_order(thd, thd->lex->select_lex.ref_pointer_array,
&tables, fields, all_fields, order) ||
!(sortorder= make_unireg_sortorder(order, &length, NULL)) ||
(from->sort.found_records= filesort(thd, from, sortorder, length,
NULL, HA_POS_ERROR,
true,
&examined_rows, &found_rows)) ==
HA_POS_ERROR)
goto err;
}
thd_progress_next_stage(thd);
}
THD_STAGE_INFO(thd, stage_copy_to_tmp_table);
/* Tell handler that we have values for all columns in the to table */
to->use_all_columns();
to->mark_virtual_columns_for_write(TRUE);
if (init_read_record(&info, thd, from, (SQL_SELECT *) 0, 1, 1, FALSE))
goto err;
if (ignore && !alter_ctx->fk_error_if_delete_row)
to->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
thd->get_stmt_da()->reset_current_row_for_warning();
restore_record(to, s->default_values); // Create empty record
if (to->default_field && to->update_default_fields())
goto err;
thd->progress.max_counter= from->file->records();
time_to_report_progress= MY_HOW_OFTEN_TO_WRITE/10;
while (!(error=info.read_record(&info)))
{
if (thd->killed)
{
thd->send_kill_message();
error= 1;
break;
}
if (from->vfield)
update_virtual_fields(thd, from);
if (++thd->progress.counter >= time_to_report_progress)
{
time_to_report_progress+= MY_HOW_OFTEN_TO_WRITE/10;
thd_progress_report(thd, thd->progress.counter,
thd->progress.max_counter);
}
/* Return error if source table isn't empty. */
if (alter_ctx->error_if_not_empty)
{
error= 1;
break;
}
if (to->next_number_field)
{
if (auto_increment_field_copied)
to->auto_increment_field_not_null= TRUE;
else
to->next_number_field->reset();
}
for (Copy_field *copy_ptr=copy ; copy_ptr != copy_end ; copy_ptr++)
{
copy_ptr->do_copy(copy_ptr);
}
prev_insert_id= to->file->next_insert_id;
if (to->vfield)
update_virtual_fields(thd, to, VCOL_UPDATE_FOR_WRITE);
if (thd->is_error())
{
error= 1;
break;
}
error=to->file->ha_write_row(to->record[0]);
to->auto_increment_field_not_null= FALSE;
if (error)
{
if (to->file->is_fatal_error(error, HA_CHECK_DUP))
{
/* Not a duplicate key error. */
to->file->print_error(error, MYF(0));
error= 1;
break;
}
else
{
/* Duplicate key error. */
if (alter_ctx->fk_error_if_delete_row)
{
/*
We are trying to omit a row from the table which serves as parent
in a foreign key. This might have broken referential integrity so
emit an error. Note that we can't ignore this error even if we are
executing ALTER IGNORE TABLE. IGNORE allows to skip rows, but
doesn't allow to break unique or foreign key constraints,
*/
my_error(ER_FK_CANNOT_DELETE_PARENT, MYF(0),
alter_ctx->fk_error_id,
alter_ctx->fk_error_table);
break;
}
if (ignore)
{
/* This ALTER IGNORE TABLE. Simply skip row and continue. */
to->file->restore_auto_increment(prev_insert_id);
delete_count++;
}
else
{
/* Ordinary ALTER TABLE. Report duplicate key error. */
uint key_nr= to->file->get_dup_key(error);
if ((int) key_nr >= 0)
{
const char *err_msg= ER(ER_DUP_ENTRY_WITH_KEY_NAME);
if (key_nr == 0 &&
(to->key_info[0].key_part[0].field->flags &
AUTO_INCREMENT_FLAG))
err_msg= ER(ER_DUP_ENTRY_AUTOINCREMENT_CASE);
print_keydup_error(to, key_nr == MAX_KEY ? NULL :
&to->key_info[key_nr],
err_msg, MYF(0));
}
else
to->file->print_error(error, MYF(0));
break;
}
}
}
else
found_count++;
thd->get_stmt_da()->inc_current_row_for_warning();
}
end_read_record(&info);
free_io_cache(from);
delete [] copy;
THD_STAGE_INFO(thd, stage_enabling_keys);
thd_progress_next_stage(thd);
if (error > 0)
{
/* We are going to drop the temporary table */
to->file->extra(HA_EXTRA_PREPARE_FOR_DROP);
}
if (to->file->ha_end_bulk_insert() && error <= 0)
{
to->file->print_error(my_errno,MYF(0));
error= 1;
}
to->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
if (mysql_trans_commit_alter_copy_data(thd))
error= 1;
err:
thd->variables.sql_mode= save_sql_mode;
thd->abort_on_warning= 0;
*copied= found_count;
*deleted=delete_count;
to->file->ha_release_auto_increment();
if (to->file->ha_external_lock(thd,F_UNLCK))
error=1;
if (error < 0 && to->file->extra(HA_EXTRA_PREPARE_FOR_RENAME))
error= 1;
thd_progress_end(thd);
DBUG_RETURN(error > 0 ? -1 : 0);
}
/*
Recreates one table by calling mysql_alter_table().
SYNOPSIS
mysql_recreate_table()
thd Thread handler
table_list Table to recreate
table_copy Recreate the table by using
ALTER TABLE COPY algorithm
RETURN
Like mysql_alter_table().
*/
bool mysql_recreate_table(THD *thd, TABLE_LIST *table_list, bool table_copy)
{
HA_CREATE_INFO create_info;
Alter_info alter_info;
TABLE_LIST *next_table= table_list->next_global;
DBUG_ENTER("mysql_recreate_table");
/* Set lock type which is appropriate for ALTER TABLE. */
table_list->lock_type= TL_READ_NO_INSERT;
/* Same applies to MDL request. */
table_list->mdl_request.set_type(MDL_SHARED_NO_WRITE);
/* hide following tables from open_tables() */
table_list->next_global= NULL;
bzero((char*) &create_info, sizeof(create_info));
create_info.row_type=ROW_TYPE_NOT_USED;
create_info.default_table_charset=default_charset_info;
/* Force alter table to recreate table */
alter_info.flags= (Alter_info::ALTER_CHANGE_COLUMN |
Alter_info::ALTER_RECREATE);
if (table_copy)
alter_info.requested_algorithm= Alter_info::ALTER_TABLE_ALGORITHM_COPY;
bool res= mysql_alter_table(thd, NullS, NullS, &create_info,
table_list, &alter_info, 0,
(ORDER *) 0, 0);
table_list->next_global= next_table;
DBUG_RETURN(res);
}
bool mysql_checksum_table(THD *thd, TABLE_LIST *tables,
HA_CHECK_OPT *check_opt)
{
TABLE_LIST *table;
List<Item> field_list;
Item *item;
Protocol *protocol= thd->protocol;
DBUG_ENTER("mysql_checksum_table");
/*
CHECKSUM TABLE returns results and rollbacks statement transaction,
so it should not be used in stored function or trigger.
*/
DBUG_ASSERT(! thd->in_sub_stmt);
field_list.push_back(item = new Item_empty_string("Table", NAME_LEN*2));
item->maybe_null= 1;
field_list.push_back(item= new Item_int("Checksum",
(longlong) 1,
MY_INT64_NUM_DECIMAL_DIGITS));
item->maybe_null= 1;
if (protocol->send_result_set_metadata(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
DBUG_RETURN(TRUE);
/*
Close all temporary tables which were pre-open to simplify
privilege checking. Clear all references to closed tables.
*/
close_thread_tables(thd);
for (table= tables; table; table= table->next_local)
table->table= NULL;
/* Open one table after the other to keep lock time as short as possible. */
for (table= tables; table; table= table->next_local)
{
char table_name[SAFE_NAME_LEN*2+2];
TABLE *t;
TABLE_LIST *save_next_global;
strxmov(table_name, table->db ,".", table->table_name, NullS);
/* Remember old 'next' pointer and break the list. */
save_next_global= table->next_global;
table->next_global= NULL;
table->lock_type= TL_READ;
/* Allow to open real tables only. */
table->required_type= FRMTYPE_TABLE;
if (open_temporary_tables(thd, table) ||
open_and_lock_tables(thd, table, FALSE, 0))
{
t= NULL;
}
else
t= table->table;
table->next_global= save_next_global;
protocol->prepare_for_resend();
protocol->store(table_name, system_charset_info);
if (!t)
{
/* Table didn't exist */
protocol->store_null();
}
else
{
/* Call ->checksum() if the table checksum matches 'old_mode' settings */
if (!(check_opt->flags & T_EXTEND) &&
(((t->file->ha_table_flags() & HA_HAS_OLD_CHECKSUM) && thd->variables.old_mode) ||
((t->file->ha_table_flags() & HA_HAS_NEW_CHECKSUM) && !thd->variables.old_mode)))
protocol->store((ulonglong)t->file->checksum());
else if (check_opt->flags & T_QUICK)
protocol->store_null();
else
{
/* calculating table's checksum */
ha_checksum crc= 0;
uchar null_mask=256 - (1 << t->s->last_null_bit_pos);
t->use_all_columns();
if (t->file->ha_rnd_init(1))
protocol->store_null();
else
{
for (;;)
{
if (thd->killed)
{
/*
we've been killed; let handler clean up, and remove the
partial current row from the recordset (embedded lib)
*/
t->file->ha_rnd_end();
thd->protocol->remove_last_row();
goto err;
}
ha_checksum row_crc= 0;
int error= t->file->ha_rnd_next(t->record[0]);
if (unlikely(error))
{
if (error == HA_ERR_RECORD_DELETED)
continue;
break;
}
if (t->s->null_bytes)
{
/* fix undefined null bits */
t->record[0][t->s->null_bytes-1] |= null_mask;
if (!(t->s->db_create_options & HA_OPTION_PACK_RECORD))
t->record[0][0] |= 1;
row_crc= my_checksum(row_crc, t->record[0], t->s->null_bytes);
}
for (uint i= 0; i < t->s->fields; i++ )
{
Field *f= t->field[i];
if (! thd->variables.old_mode && f->is_real_null(0))
continue;
/*
BLOB and VARCHAR have pointers in their field, we must convert
to string; GEOMETRY is implemented on top of BLOB.
BIT may store its data among NULL bits, convert as well.
*/
switch (f->type()) {
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_VARCHAR:
case MYSQL_TYPE_GEOMETRY:
case MYSQL_TYPE_BIT:
{
String tmp;
f->val_str(&tmp);
row_crc= my_checksum(row_crc, (uchar*) tmp.ptr(),
tmp.length());
break;
}
default:
row_crc= my_checksum(row_crc, f->ptr, f->pack_length());
break;
}
}
crc+= row_crc;
}
protocol->store((ulonglong)crc);
t->file->ha_rnd_end();
}
}
trans_rollback_stmt(thd);
close_thread_tables(thd);
}
if (thd->transaction_rollback_request)
{
/*
If transaction rollback was requested we honor it. To do this we
abort statement and return error as not only CHECKSUM TABLE is
rolled back but the whole transaction in which it was used.
*/
thd->protocol->remove_last_row();
goto err;
}
/* Hide errors from client. Return NULL for problematic tables instead. */
thd->clear_error();
if (protocol->write())
goto err;
}
my_eof(thd);
DBUG_RETURN(FALSE);
err:
DBUG_RETURN(TRUE);
}
/**
@brief Check if the table can be created in the specified storage engine.
Checks if the storage engine is enabled and supports the given table
type (e.g. normal, temporary, system). May do engine substitution
if the requested engine is disabled.
@param thd Thread descriptor.
@param db_name Database name.
@param table_name Name of table to be created.
@param create_info Create info from parser, including engine.
@retval true Engine not available/supported, error has been reported.
@retval false Engine available/supported.
*/
static bool check_engine(THD *thd, const char *db_name,
const char *table_name, HA_CREATE_INFO *create_info)
{
DBUG_ENTER("check_engine");
handlerton **new_engine= &create_info->db_type;
handlerton *req_engine= *new_engine;
handlerton *enf_engine= thd->variables.enforced_table_plugin ? plugin_hton(thd->variables.enforced_table_plugin) : NULL;
bool no_substitution= thd->variables.sql_mode & MODE_NO_ENGINE_SUBSTITUTION;
*new_engine= ha_checktype(thd, req_engine, no_substitution);
DBUG_ASSERT(*new_engine);
if (!*new_engine)
DBUG_RETURN(true);
if (enf_engine && enf_engine != *new_engine)
{
if (no_substitution)
{
const char *engine_name= ha_resolve_storage_engine_name(req_engine);
my_error(ER_UNKNOWN_STORAGE_ENGINE, MYF(0), engine_name, engine_name);
DBUG_RETURN(TRUE);
}
*new_engine= enf_engine;
}
if (req_engine && req_engine != *new_engine)
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
ER_WARN_USING_OTHER_HANDLER,
ER(ER_WARN_USING_OTHER_HANDLER),
ha_resolve_storage_engine_name(*new_engine),
table_name);
}
if (create_info->tmp_table() &&
ha_check_storage_engine_flag(*new_engine, HTON_TEMPORARY_NOT_SUPPORTED))
{
if (create_info->used_fields & HA_CREATE_USED_ENGINE)
{
my_error(ER_ILLEGAL_HA_CREATE_OPTION, MYF(0),
hton_name(*new_engine)->str, "TEMPORARY");
*new_engine= 0;
DBUG_RETURN(true);
}
*new_engine= myisam_hton;
}
DBUG_RETURN(false);
}
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