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A fix and test cases for

Browse Source 
Bug#4968 "Stored procedure crash if cursor opened on altered table"
Bug#19733 "Repeated alter, or repeated create/drop, fails"
Bug#19182 "CREATE TABLE bar (m INT) SELECT n FROM foo; doesn't work from 
stored procedure."
Bug#6895 "Prepared Statements: ALTER TABLE DROP COLUMN does nothing"
Bug#22060 "ALTER TABLE x AUTO_INCREMENT=y in SP crashes server"

Test cases for bugs 4968, 19733, 6895 will be added in 5.0.

Re-execution of CREATE DATABASE, CREATE TABLE and ALTER TABLE 
statements in stored routines or as prepared statements caused
incorrect results (and crashes in versions prior to 5.0.25).
In 5.1 the problem occured only for CREATE DATABASE, CREATE TABLE
SELECT and CREATE TABLE with INDEX/DATA DIRECTOY options).

The problem of bugs 4968, 19733, 19282 and 6895 was that functions
mysql_prepare_table, mysql_create_table and mysql_alter_table were not
re-execution friendly: during their operation they used to modify contents
of LEX (members create_info, alter_info, key_list, create_list),
thus making the LEX unusable for the next execution.
In particular, these functions removed processed columns and keys from
create_list, key_list and drop_list. Search the code in sql_table.cc 
for drop_it.remove() and similar patterns to find evidence.

The fix is to supply to these functions a usable copy of each of the
above structures at every re-execution of an SQL statement. 

To simplify memory management, LEX::key_list and LEX::create_list
were added to LEX::alter_info, a fresh copy of which is created for
every execution.

The problem of crashing bug 22060 stemmed from the fact that the above 
metnioned functions were not only modifying HA_CREATE_INFO structure in 
LEX, but also were changing it to point to areas in volatile memory of 
the execution memory root.
 
The patch solves this problem by creating and using an on-stack
copy of HA_CREATE_INFO (note that code in 5.1 already creates and
uses a copy of this structure in mysql_create_table()/alter_table(),
but this approach didn't work well for CREATE TABLE SELECT statement).
This commit is contained in:
kostja@bodhi.local
2006-12-08 02:20:09 +03:00
parent c6c172e40c
commit 90072e69b3
12 changed files with 511 additions and 441 deletions
Download Patch File Download Diff File Expand all files Collapse all files

373
sql/sql_table.cc
View File

@@ -455,8 +455,7 @@ void calculate_interval_lengths(CHARSET_INFO *cs, TYPELIB *interval,
mysql_prepare_table()
thd Thread object
create_info Create information (like MAX_ROWS)
fields List of fields to create
keys List of keys to create
alter_info List of columns and indexes to create
DESCRIPTION
Prepares the table and key structures for table creation.
@@ -467,8 +466,8 @@ void calculate_interval_lengths(CHARSET_INFO *cs, TYPELIB *interval,
*/
int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
List<create_field> &fields,
List<Key> &keys, bool tmp_table, uint &db_options,
Alter_info *alter_info,
bool tmp_table, uint &db_options,
handler *file, KEY *&key_info_buffer,
uint *key_count, int select_field_count)
{
@@ -481,10 +480,11 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
int timestamps= 0, timestamps_with_niladic= 0;
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);
DBUG_ENTER("mysql_prepare_table");
List_iterator<create_field> it(fields),it2(fields);
select_field_pos=fields.elements - select_field_count;
select_field_pos= alter_info->create_list.elements - select_field_count;
null_fields=blob_columns=0;
for (field_no=0; (sql_field=it++) ; field_no++)
@@ -882,7 +882,8 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
/* Create keys */
List_iterator<Key> key_iterator(keys), key_iterator2(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;
@@ -1332,23 +1333,27 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
SYNOPSIS
mysql_create_table()
thd Thread object
db Database
table_name Table name
create_info Create information (like MAX_ROWS)
fields List of fields to create
keys List of keys to create
tmp_table Set to 1 if this is an internal temporary table
(From ALTER TABLE)
thd Thread object
db Database
table_name Table name
create_info [in/out] Create information (like MAX_ROWS)
alter_info [in/out] List of columns and indexes to create
tmp_table Set to 1 if this is an internal temporary table
(From ALTER TABLE)
DESCRIPTION
If one creates a temporary table, this is automaticly opened
If one creates a temporary table, this is automatically opened
no_log is needed for the case of CREATE ... SELECT,
as the logging will be done later in sql_insert.cc
select_field_count is also used for CREATE ... SELECT,
and must be zero for standard create of table.
Note that structures passed as 'create_info' and 'alter_info' parameters
may be modified by this function. It is responsibility of the caller to
make a copy of create_info in order to provide correct execution in
prepared statements/stored routines.
RETURN VALUES
0 ok
-1 error
@@ -1356,8 +1361,8 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
int mysql_create_table(THD *thd,const char *db, const char *table_name,
HA_CREATE_INFO *create_info,
List<create_field> &fields,
List<Key> &keys,bool tmp_table,
Alter_info *alter_info,
bool tmp_table,
uint select_field_count)
{
char path[FN_REFLEN];
@@ -1370,7 +1375,7 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
DBUG_ENTER("mysql_create_table");
/* Check for duplicate fields and check type of table to create */
if (!fields.elements)
if (!alter_info->create_list.elements)
{
my_error(ER_TABLE_MUST_HAVE_COLUMNS,MYF(0));
DBUG_RETURN(-1);
@@ -1422,10 +1427,10 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
create_info->default_table_charset= db_info.default_table_charset;
}
if (mysql_prepare_table(thd, create_info, fields,
keys, tmp_table, db_options, file,
key_info_buffer, &key_count,
select_field_count))
if (mysql_prepare_table(thd, create_info, alter_info, tmp_table,
db_options, file,
key_info_buffer, &key_count,
select_field_count))
DBUG_RETURN(-1);
/* Check if table exists */
@@ -1502,8 +1507,8 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
create_info->table_options=db_options;
if (rea_create_table(thd, path, db, table_name,
create_info, fields, key_count,
key_info_buffer))
create_info, alter_info->create_list,
key_count, key_info_buffer))
goto end;
if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
{
@@ -1591,8 +1596,7 @@ make_unique_key_name(const char *field_name,KEY *start,KEY *end)
TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
const char *db, const char *name,
List<create_field> *extra_fields,
List<Key> *keys,
Alter_info *alter_info,
List<Item> *items,
MYSQL_LOCK **lock)
{
@@ -1626,7 +1630,7 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
((Item_field *)item)->field :
(Field*) 0))))
DBUG_RETURN(0);
extra_fields->push_back(cr_field);
alter_info->create_list.push_back(cr_field);
}
/* create and lock table */
/* QQ: create and open should be done atomic ! */
@@ -1640,8 +1644,8 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
open_table().
*/
tmp_disable_binlog(thd);
if (!mysql_create_table(thd,db,name,create_info,*extra_fields,
*keys,0,select_field_count))
if (!mysql_create_table(thd, db, name, create_info, alter_info,
0, select_field_count))
{
if (!(table=open_table(thd,db,name,name,(bool*) 0)))
quick_rm_table(create_info->db_type,db,table_case_name(create_info,name));
@@ -2145,6 +2149,7 @@ send_result_message:
case HA_ADMIN_TRY_ALTER:
{
my_bool save_no_send_ok= thd->net.no_send_ok;
/*
This is currently used only by InnoDB. ha_innobase::optimize() answers
"try with alter", so here we close the table, do an ALTER TABLE,
@@ -2154,7 +2159,9 @@ send_result_message:
TABLE_LIST *save_next= table->next;
table->next= 0;
tmp_disable_binlog(thd); // binlogging is done by caller if wanted
result_code= mysql_recreate_table(thd, table, 0);
thd->net.no_send_ok= TRUE;
result_code= mysql_recreate_table(thd, table);
thd->net.no_send_ok= save_no_send_ok;
reenable_binlog(thd);
close_thread_tables(thd);
if (!result_code) // recreation went ok
@@ -2634,219 +2641,25 @@ err:
}
#ifdef NOT_USED
/*
CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with
the proper arguments. This isn't very fast but it should work for most
cases.
One should normally create all indexes with CREATE TABLE or ALTER TABLE.
*/
int mysql_create_indexes(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
{
List<create_field> fields;
List<Alter_drop> drop;
List<Alter_column> alter;
HA_CREATE_INFO create_info;
int rc;
uint idx;
uint db_options;
uint key_count;
TABLE *table;
Field **f_ptr;
KEY *key_info_buffer;
char path[FN_REFLEN+1];
DBUG_ENTER("mysql_create_index");
/*
Try to use online generation of index.
This requires that all indexes can be created online.
Otherwise, the old alter table procedure is executed.
Open the table to have access to the correct table handler.
*/
if (!(table=open_ltable(thd,table_list,TL_WRITE_ALLOW_READ)))
DBUG_RETURN(-1);
/*
The add_index method takes an array of KEY structs for the new indexes.
Preparing a new table structure generates this array.
It needs a list with all fields of the table, which does not need to
be correct in every respect. The field names are important.
*/
for (f_ptr= table->field; *f_ptr; f_ptr++)
{
create_field *c_fld= new create_field(*f_ptr, *f_ptr);
c_fld->unireg_check= Field::NONE; /*avoid multiple auto_increments*/
fields.push_back(c_fld);
}
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
create_info.default_table_charset= thd->variables.collation_database;
db_options= 0;
if (mysql_prepare_table(thd, &create_info, fields,
keys, /*tmp_table*/ 0, db_options, table->file,
key_info_buffer, key_count,
/*select_field_count*/ 0))
DBUG_RETURN(-1);
/*
Check if all keys can be generated with the add_index method.
If anyone cannot, then take the old way.
*/
for (idx=0; idx< key_count; idx++)
{
DBUG_PRINT("info", ("creating index %s", key_info_buffer[idx].name));
if (!(table->file->index_ddl_flags(key_info_buffer+idx)&
(HA_DDL_ONLINE| HA_DDL_WITH_LOCK)))
break ;
}
if ((idx < key_count)|| !key_count)
{
/* Re-initialize the create_info, which was changed by prepare table. */
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
create_info.default_table_charset= thd->variables.collation_database;
/* Cleanup the fields list. We do not want to create existing fields. */
fields.delete_elements();
if (real_alter_table(thd, table_list->db, table_list->real_name,
&create_info, table_list, table,
fields, keys, drop, alter, 0, (ORDER*)0,
ALTER_ADD_INDEX, DUP_ERROR))
/* Don't need to free((gptr) key_info_buffer);*/
DBUG_RETURN(-1);
}
else
{
if (table->file->add_index(table, key_info_buffer, key_count)||
build_table_path(path, sizeof(path), table_list->db,
(lower_case_table_names == 2) ?
table_list->alias : table_list->real_name,
reg_ext) == 0 ||
mysql_create_frm(thd, path, &create_info,
fields, key_count, key_info_buffer, table->file))
/* don't need to free((gptr) key_info_buffer);*/
DBUG_RETURN(-1);
}
/* don't need to free((gptr) key_info_buffer);*/
DBUG_RETURN(0);
}
int mysql_drop_indexes(THD *thd, TABLE_LIST *table_list,
List<Alter_drop> &drop)
{
List<create_field> fields;
List<Key> keys;
List<Alter_column> alter;
HA_CREATE_INFO create_info;
uint idx;
uint db_options;
uint key_count;
uint *key_numbers;
TABLE *table;
Field **f_ptr;
KEY *key_info;
KEY *key_info_buffer;
char path[FN_REFLEN];
DBUG_ENTER("mysql_drop_index");
/*
Try to use online generation of index.
This requires that all indexes can be created online.
Otherwise, the old alter table procedure is executed.
Open the table to have access to the correct table handler.
*/
if (!(table=open_ltable(thd,table_list,TL_WRITE_ALLOW_READ)))
DBUG_RETURN(-1);
/*
The drop_index method takes an array of key numbers.
It cannot get more entries than keys in the table.
*/
key_numbers= (uint*) thd->alloc(sizeof(uint*)*table->keys);
key_count= 0;
/*
Get the number of each key and check if it can be created online.
*/
List_iterator<Alter_drop> drop_it(drop);
Alter_drop *drop_key;
while ((drop_key= drop_it++))
{
/* Find the key in the table. */
key_info=table->key_info;
for (idx=0; idx< table->keys; idx++, key_info++)
{
if (!my_strcasecmp(system_charset_info, key_info->name, drop_key->name))
break;
}
if (idx>= table->keys)
{
my_error(ER_CANT_DROP_FIELD_OR_KEY, MYF(0), drop_key->name);
/*don't need to free((gptr) key_numbers);*/
DBUG_RETURN(-1);
}
/*
Check if the key can be generated with the add_index method.
If anyone cannot, then take the old way.
*/
DBUG_PRINT("info", ("dropping index %s", table->key_info[idx].name));
if (!(table->file->index_ddl_flags(table->key_info+idx)&
(HA_DDL_ONLINE| HA_DDL_WITH_LOCK)))
break ;
key_numbers[key_count++]= idx;
}
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
create_info.default_table_charset= thd->variables.collation_database;
if ((drop_key)|| (drop.elements<= 0))
{
if (real_alter_table(thd, table_list->db, table_list->real_name,
&create_info, table_list, table,
fields, keys, drop, alter, 0, (ORDER*)0,
ALTER_DROP_INDEX, DUP_ERROR))
/*don't need to free((gptr) key_numbers);*/
DBUG_RETURN(-1);
}
else
{
db_options= 0;
if (table->file->drop_index(table, key_numbers, key_count)||
mysql_prepare_table(thd, &create_info, fields,
keys, /*tmp_table*/ 0, db_options, table->file,
key_info_buffer, key_count,
/*select_field_count*/ 0)||
build_table_path(path, sizeof(path), table_list->db,
(lower_case_table_names == 2) ?
table_list->alias : table_list->real_name,
reg_ext) == 0 ||
mysql_create_frm(thd, path, &create_info,
fields, key_count, key_info_buffer, table->file))
/*don't need to free((gptr) key_numbers);*/
DBUG_RETURN(-1);
}
/*don't need to free((gptr) key_numbers);*/
DBUG_RETURN(0);
}
#endif /* NOT_USED */
/*
Alter table
NOTE
The structures passed as 'create_info' and 'alter_info' parameters may
be modified by this function. It is responsibility of the caller to make
a copy of create_info in order to provide correct execution in prepared
statements/stored routines.
*/
int mysql_alter_table(THD *thd,char *new_db, char *new_name,
HA_CREATE_INFO *create_info,
TABLE_LIST *table_list,
List<create_field> &fields, List<Key> &keys,
Alter_info *alter_info,
uint order_num, ORDER *order,
enum enum_duplicates handle_duplicates, bool ignore,
ALTER_INFO *alter_info, bool do_send_ok)
enum enum_duplicates handle_duplicates, bool ignore)
{
TABLE *table,*new_table;
int error;
@@ -3008,8 +2821,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
mysql_bin_log.write(&qinfo);
}
if (do_send_ok)
send_ok(thd);
send_ok(thd);
}
else if (error > 0)
{
@@ -3035,10 +2847,9 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
restore_record(table,default_values); // Empty record for DEFAULT
List_iterator<Alter_drop> drop_it(alter_info->drop_list);
List_iterator<create_field> def_it(fields);
List_iterator<create_field> def_it(alter_info->create_list);
List_iterator<Alter_column> alter_it(alter_info->alter_list);
List<create_field> create_list; // Add new fields here
List<Key> key_list; // Add new keys here
Alter_info new_info; // Add new columns and indexes here
create_field *def;
/*
@@ -3084,13 +2895,13 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
def->field=field;
if (!def->after)
{
create_list.push_back(def);
new_info.create_list.push_back(def);
def_it.remove();
}
}
else
{ // Use old field value
create_list.push_back(def=new create_field(field,field));
new_info.create_list.push_back(def= new create_field(field, field));
alter_it.rewind(); // Change default if ALTER
Alter_column *alter;
while ((alter=alter_it++))
@@ -3111,7 +2922,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
}
}
def_it.rewind();
List_iterator<create_field> find_it(create_list);
List_iterator<create_field> find_it(new_info.create_list);
while ((def=def_it++)) // Add new columns
{
if (def->change && ! def->field)
@@ -3120,9 +2931,9 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
DBUG_RETURN(-1);
}
if (!def->after)
create_list.push_back(def);
new_info.create_list.push_back(def);
else if (def->after == first_keyword)
create_list.push_front(def);
new_info.create_list.push_front(def);
else
{
create_field *find;
@@ -3146,7 +2957,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
table_name);
DBUG_RETURN(-1);
}
if (!create_list.elements)
if (!new_info.create_list.elements)
{
my_error(ER_CANT_REMOVE_ALL_FIELDS,MYF(0));
DBUG_RETURN(-1);
@@ -3157,8 +2968,8 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
for which some fields exists.
*/
List_iterator<Key> key_it(keys);
List_iterator<create_field> field_it(create_list);
List_iterator<Key> key_it(alter_info->key_list);
List_iterator<create_field> field_it(new_info.create_list);
List<key_part_spec> key_parts;
KEY *key_info=table->key_info;
@@ -3216,24 +3027,37 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
key_part_length));
}
if (key_parts.elements)
key_list.push_back(new Key(key_info->flags & HA_SPATIAL ? Key::SPATIAL :
(key_info->flags & HA_NOSAME ?
(!my_strcasecmp(system_charset_info,
key_name, primary_key_name) ?
Key::PRIMARY : Key::UNIQUE) :
(key_info->flags & HA_FULLTEXT ?
Key::FULLTEXT : Key::MULTIPLE)),
key_name,
key_info->algorithm,
test(key_info->flags & HA_GENERATED_KEY),
key_parts));
{
Key *key;
enum Key::Keytype key_type;
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,
key_info->algorithm,
test(key_info->flags & HA_GENERATED_KEY),
key_parts);
new_info.key_list.push_back(key);
}
}
{
Key *key;
while ((key=key_it++)) // Add new keys
{
if (key->type != Key::FOREIGN_KEY)
key_list.push_back(key);
new_info.key_list.push_back(key);
if (key->name &&
!my_strcasecmp(system_charset_info,key->name,primary_key_name))
{
@@ -3337,7 +3161,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
/* We don't log the statement, it will be logged later. */
tmp_disable_binlog(thd);
error= mysql_create_table(thd, new_db, tmp_name,
create_info,create_list,key_list,1,0);
create_info, &new_info, 1, 0);
reenable_binlog(thd);
if (error)
DBUG_RETURN(error);
@@ -3366,9 +3190,9 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
next_insert_id=thd->next_insert_id; // Remember for loggin
copied=deleted=0;
if (!new_table->is_view)
error=copy_data_between_tables(table,new_table,create_list,
handle_duplicates, ignore,
order_num, order, &copied, &deleted);
error= copy_data_between_tables(table, new_table, new_info.create_list,
handle_duplicates, ignore,
order_num, order, &copied, &deleted);
thd->last_insert_id=next_insert_id; // Needed for correct log
thd->count_cuted_fields= CHECK_FIELD_IGNORE;
@@ -3574,8 +3398,7 @@ end_temporary:
my_snprintf(tmp_name, sizeof(tmp_name), ER(ER_INSERT_INFO),
(ulong) (copied + deleted), (ulong) deleted,
(ulong) thd->cuted_fields);
if (do_send_ok)
send_ok(thd,copied+deleted,0L,tmp_name);
send_ok(thd, copied + deleted, 0L, tmp_name);
thd->some_tables_deleted=0;
DBUG_RETURN(0);
@@ -3760,30 +3583,26 @@ copy_data_between_tables(TABLE *from,TABLE *to,
mysql_recreate_table()
thd Thread handler
tables Tables to recreate
do_send_ok If we should send_ok() or leave it to caller
RETURN
Like mysql_alter_table().
*/
int mysql_recreate_table(THD *thd, TABLE_LIST *table_list,
bool do_send_ok)
int mysql_recreate_table(THD *thd, TABLE_LIST *table_list)
{
DBUG_ENTER("mysql_recreate_table");
LEX *lex= thd->lex;
HA_CREATE_INFO create_info;
lex->create_list.empty();
lex->key_list.empty();
lex->col_list.empty();
lex->alter_info.reset();
lex->alter_info.is_simple= 0; // Force full recreate
Alter_info alter_info;
DBUG_ENTER("mysql_recreate_table");
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
create_info.row_type=ROW_TYPE_DEFAULT;
create_info.default_table_charset=default_charset_info;
alter_info.is_simple= 0; // Force full recreate
DBUG_RETURN(mysql_alter_table(thd, NullS, NullS, &create_info,
table_list, lex->create_list,
lex->key_list, 0, (ORDER *) 0,
DUP_ERROR, 0, &lex->alter_info, do_send_ok));
table_list, &alter_info,
0, (ORDER *) 0, DUP_ERROR, 0));
}