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merge with 4.1

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BitKeeper/etc/ignore:
  auto-union
BitKeeper/etc/logging_ok:
  auto-union
BitKeeper/triggers/post-commit:
  Auto merged
Docs/Support/texi2html:
  Auto merged
Makefile.am:
  Auto merged
client/Makefile.am:
  Auto merged
client/mysql.cc:
  Auto merged
client/mysqldump.c:
  Auto merged
include/my_base.h:
  Auto merged
include/my_global.h:
  Auto merged
include/my_pthread.h:
  Auto merged
include/my_sys.h:
  Auto merged
include/my_time.h:
  Auto merged
include/mysql.h:
  Auto merged
include/mysql_com.h:
  Auto merged
innobase/buf/buf0buf.c:
  Auto merged
innobase/include/row0mysql.h:
  Auto merged
innobase/row/row0sel.c:
  Auto merged
libmysql/libmysql.c:
  Auto merged
libmysqld/examples/Makefile.am:
  Auto merged
myisam/mi_check.c:
  Auto merged
mysql-test/include/ps_modify.inc:
  Auto merged
mysql-test/install_test_db.sh:
  Auto merged
mysql-test/r/alter_table.result:
  Auto merged
mysql-test/r/auto_increment.result:
  Auto merged
mysql-test/r/bdb.result:
  Auto merged
mysql-test/r/ctype_latin1_de.result:
  Auto merged
mysql-test/r/ctype_recoding.result:
  Auto merged
mysql-test/r/fulltext.result:
  Auto merged
mysql-test/r/func_gconcat.result:
  Auto merged
mysql-test/r/func_group.result:
  Auto merged
mysql-test/r/func_if.result:
  Auto merged
mysql-test/t/derived.test:
  Auto merged
mysql-test/t/insert.test:
  merge with 4.1
  Fixed test case to not use 'if exists' when it shouldn't
mysql-test/t/range.test:
  merge with 4.1
  Added missing drop table
sql/ha_ndbcluster.cc:
  merge with 4.1
  Simple optimization: use max() instead of ? :
sql/item_func.cc:
  merge with 4.1
  (Added back old variable names for easier merges)
sql/opt_range.cc:
  merge with 4.1
  Removed argument 'parent_alloc' from QUICK_RANGE_SELECT as this was not used
  Added assert if using QUICK_GROUP_MIN_MAX_SELECT with parent_alloc as the init() function can't handle this
  Changed back get_quick_select_for_ref() to use it's own alloc root becasue this function may be called several times for one query
sql/sql_handler.cc:
  merge with 4.1
  change variable 'err' to 'error' as same function had a label named 'err'
sql/sql_update.cc:
  Use multi-update code from 5.0 instead of 4.1
  We will fix the locking code shortly in 5.0 to be faster than in 4.1
This commit is contained in:
unknown
2004-10-29 19:26:52 +03:00
parent f41bba8c61 5be6c328f5
commit f095274fe8
1288 changed files with 58423 additions and 21752 deletions
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187
sql/sql_class.h
View File

@ -427,6 +427,9 @@ struct system_variables
my_bool low_priority_updates;
my_bool new_mode;
my_bool query_cache_wlock_invalidate;
#ifdef HAVE_INNOBASE_DB
my_bool innodb_table_locks;
#endif /* HAVE_INNOBASE_DB */
my_bool old_passwords;
/* Only charset part of these variables is sensible */
@ -527,15 +530,29 @@ public:
STATEMENT, PREPARED_STATEMENT, STORED_PROCEDURE
};
/*
This constructor is used only when Item_arena is created as
backup storage for another instance of Item_arena.
*/
Item_arena() {};
/*
Create arena for already constructed THD using its variables as
parameters for memory root initialization.
*/
Item_arena(THD *thd);
Item_arena();
/*
Create arena and optionally init memory root with minimal values.
Particularly used if Item_arena is part of Statement.
*/
Item_arena(bool init_mem_root);
virtual Type type() const;
virtual ~Item_arena();
virtual ~Item_arena() {};
inline bool is_stmt_prepare() const { return (int)state < (int)PREPARED; }
inline bool is_first_stmt_execute() const { return state == PREPARED; }
inline bool is_conventional() const
inline bool is_stmt_execute() const
{ return state == PREPARED || state == EXECUTED; }
inline bool is_conventional_execution() const
{ return state == CONVENTIONAL_EXECUTION; }
inline gptr alloc(unsigned int size) { return alloc_root(&mem_root,size); }
inline gptr calloc(unsigned int size)
@ -620,6 +637,23 @@ public:
Points to the query associated with this statement. It's const, but
we need to declare it char * because all table handlers are written
in C and need to point to it.
Note that (A) if we set query = NULL, we must at the same time set
query_length = 0, and protect the whole operation with the
LOCK_thread_count mutex. And (B) we are ONLY allowed to set query to a
non-NULL value if its previous value is NULL. We do not need to protect
operation (B) with any mutex. To avoid crashes in races, if we do not
know that thd->query cannot change at the moment, one should print
thd->query like this:
(1) reserve the LOCK_thread_count mutex;
(2) check if thd->query is NULL;
(3) if not NULL, then print at most thd->query_length characters from
it. We will see the query_length field as either 0, or the right value
for it.
Assuming that the write and read of an n-bit memory field in an n-bit
computer is atomic, we can avoid races in the above way.
This printing is needed at least in SHOW PROCESSLIST and SHOW INNODB
STATUS.
*/
char *query;
uint32 query_length; // current query length
@ -642,12 +676,6 @@ public:
void restore_backup_statement(Statement *stmt, Statement *backup);
/* return class type */
virtual Type type() const;
/*
Cleanup statement parse state (parse tree, lex) after execution of
a non-prepared SQL statement.
*/
void end_statement();
};
@ -657,7 +685,7 @@ public:
assignment in Statement::Statement)
Non-empty statement names are unique too: attempt to insert a new statement
with duplicate name causes older statement to be deleted
Statements are auto-deleted when they are removed from the map and when the
map is deleted.
*/
@ -666,7 +694,7 @@ class Statement_map
{
public:
Statement_map();
int insert(Statement *statement);
Statement *find_by_name(LEX_STRING *name)
@ -699,11 +727,18 @@ public:
}
hash_delete(&st_hash, (byte *) statement);
}
/* Erase all statements (calls Statement destructor) */
void reset()
{
hash_reset(&names_hash);
hash_reset(&st_hash);
last_found_statement= 0;
}
~Statement_map()
{
hash_free(&st_hash);
hash_free(&names_hash);
hash_free(&st_hash);
}
private:
HASH st_hash;
@ -712,6 +747,17 @@ private:
};
/*
A registry for item tree transformations performed during
query optimization. We register only those changes which require
a rollback to re-execute a prepared statement or stored procedure
yet another time.
*/
struct Item_change_record;
typedef I_List<Item_change_record> Item_change_list;
/*
For each client connection we create a separate thread with THD serving as
a thread/connection descriptor
@ -744,24 +790,6 @@ public:
struct system_variables variables; // Changeable local variables
struct system_status_var status_var; // Per thread statistic vars
pthread_mutex_t LOCK_delete; // Locked before thd is deleted
/*
Note that (A) if we set query = NULL, we must at the same time set
query_length = 0, and protect the whole operation with the
LOCK_thread_count mutex. And (B) we are ONLY allowed to set query to a
non-NULL value if its previous value is NULL. We do not need to protect
operation (B) with any mutex. To avoid crashes in races, if we do not
know that thd->query cannot change at the moment, one should print
thd->query like this:
(1) reserve the LOCK_thread_count mutex;
(2) check if thd->query is NULL;
(3) if not NULL, then print at most thd->query_length characters from
it. We will see the query_length field as either 0, or the right value
for it.
Assuming that the write and read of an n-bit memory field in an n-bit
computer is atomic, we can avoid races in the above way.
This printing is needed at least in SHOW PROCESSLIST and SHOW INNODB
STATUS.
*/
/* all prepared statements and cursors of this connection */
Statement_map stmt_map;
/*
@ -831,6 +859,7 @@ public:
*/
MYSQL_LOCK *lock; /* Current locks */
MYSQL_LOCK *locked_tables; /* Tables locked with LOCK */
HASH handler_tables_hash;
/*
One thread can hold up to one named user-level lock. This variable
points to a lock object if the lock is present. See item_func.cc and
@ -864,10 +893,10 @@ public:
THD_TRANS all; // Trans since BEGIN WORK
THD_TRANS stmt; // Trans for current statement
uint bdb_lock_count;
uint ndb_lock_count;
#ifdef HAVE_NDBCLUSTER_DB
void* ndb;
void* thd_ndb;
#endif
bool on;
/*
Tables changed in transaction (that must be invalidated in query cache).
List contain only transactional tables, that not invalidated in query
@ -888,6 +917,14 @@ public:
#ifdef SIGNAL_WITH_VIO_CLOSE
Vio* active_vio;
#endif
/*
This is to track items changed during execution of a prepared
statement/stored procedure. It's created by
register_item_tree_change() in memory root of THD, and freed in
rollback_item_tree_changes(). For conventional execution it's always 0.
*/
Item_change_list change_list;
/*
Current prepared Item_arena if there one, or 0
*/
@ -1126,6 +1163,23 @@ public:
}
inline CHARSET_INFO *charset() { return variables.character_set_client; }
void update_charset();
void change_item_tree(Item **place, Item *new_value)
{
/* TODO: check for OOM condition here */
if (!current_arena->is_conventional_execution())
nocheck_register_item_tree_change(place, *place, &mem_root);
*place= new_value;
}
void nocheck_register_item_tree_change(Item **place, Item *old_value,
MEM_ROOT *runtime_memroot);
void rollback_item_tree_changes();
/*
Cleanup statement parse state (parse tree, lex) and execution
state after execution of a non-prepared SQL statement.
*/
void end_statement();
inline int killed_errno() const
{
return killed != KILL_BAD_DATA ? killed : 0;
@ -1149,27 +1203,6 @@ public:
#define SYSTEM_THREAD_SLAVE_IO 2
#define SYSTEM_THREAD_SLAVE_SQL 4
/*
Disables binary logging for one thread, and resets it back to what it was
before being disabled.
Some functions (like the internal mysql_create_table() when it's called by
mysql_alter_table()) must NOT write to the binlog (binlogging is done at the
at a later stage of the command already, and must be, for locking reasons);
so we internally disable it temporarily by creating the Disable_binlog
object and reset the state by destroying the object (don't forget that! or
write code so that the object gets automatically destroyed when leaving a
block, see example in sql_table.cc).
*/
class Disable_binlog {
private:
THD *thd;
ulong save_options;
public:
Disable_binlog(THD *thd_arg);
~Disable_binlog();
};
/*
Used to hold information about file and file structure in exchainge
via non-DB file (...INTO OUTFILE..., ...LOAD DATA...)
@ -1209,6 +1242,13 @@ public:
unit= u;
return 0;
}
/*
Because of peculiarities of prepared statements protocol
we need to know number of columns in the result set (if
there is a result set) apart from sending columns metadata.
*/
virtual uint field_count(List<Item> &fields) const
{ return fields.elements; }
virtual bool send_fields(List<Item> &list, uint flags)=0;
virtual bool send_data(List<Item> &items)=0;
virtual bool initialize_tables (JOIN *join=0) { return 0; }
@ -1223,6 +1263,20 @@ public:
};
/*
Base class for select_result descendands which intercept and
transform result set rows. As the rows are not sent to the client,
sending of result set metadata should be suppressed as well.
*/
class select_result_interceptor: public select_result
{
public:
uint field_count(List<Item> &fields) const { return 0; }
bool send_fields(List<Item> &fields, uint flag) { return FALSE; }
};
class select_send :public select_result {
public:
select_send() {}
@ -1232,7 +1286,7 @@ public:
};
class select_to_file :public select_result {
class select_to_file :public select_result_interceptor {
protected:
sql_exchange *exchange;
File file;
@ -1244,7 +1298,6 @@ public:
select_to_file(sql_exchange *ex) :exchange(ex), file(-1),row_count(0L)
{ path[0]=0; }
~select_to_file();
bool send_fields(List<Item> &list, uint flags) { return 0; }
void send_error(uint errcode,const char *err);
bool send_eof();
void cleanup();
@ -1271,7 +1324,7 @@ public:
};
class select_insert :public select_result {
class select_insert :public select_result_interceptor {
public:
TABLE_LIST *table_list;
TABLE *table;
@ -1285,7 +1338,6 @@ class select_insert :public select_result {
bool ignore_check_option_errors);
~select_insert();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
void send_error(uint errcode,const char *err);
bool send_eof();
@ -1345,10 +1397,12 @@ public:
uint group_parts,group_length,group_null_parts;
uint quick_group;
bool using_indirect_summary_function;
/* If >0 convert all blob fields to varchar(convert_blob_length) */
uint convert_blob_length;
TMP_TABLE_PARAM()
:copy_funcs_it(copy_funcs), copy_field(0), group_parts(0),
group_length(0), group_null_parts(0)
group_length(0), group_null_parts(0), convert_blob_length(0)
{}
~TMP_TABLE_PARAM()
{
@ -1365,7 +1419,7 @@ public:
}
};
class select_union :public select_result {
class select_union :public select_result_interceptor {
public:
TABLE *table;
COPY_INFO info;
@ -1374,7 +1428,6 @@ class select_union :public select_result {
select_union(TABLE *table_par);
~select_union();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
bool send_eof();
bool flush();
@ -1382,17 +1435,14 @@ class select_union :public select_result {
};
/* Base subselect interface class */
class select_subselect :public select_result
class select_subselect :public select_result_interceptor
{
protected:
Item_subselect *item;
public:
select_subselect(Item_subselect *item);
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items)=0;
bool send_eof() { return 0; };
friend class Ttem_subselect;
};
/* Single value subselect interface class */
@ -1544,7 +1594,7 @@ public:
};
class multi_delete :public select_result
class multi_delete :public select_result_interceptor
{
TABLE_LIST *delete_tables, *table_being_deleted;
Unique **tempfiles;
@ -1557,7 +1607,6 @@ public:
multi_delete(THD *thd, TABLE_LIST *dt, uint num_of_tables);
~multi_delete();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
bool initialize_tables (JOIN *join);
void send_error(uint errcode,const char *err);
@ -1566,7 +1615,7 @@ public:
};
class multi_update :public select_result
class multi_update :public select_result_interceptor
{
TABLE_LIST *all_tables, *update_tables, *table_being_updated;
THD *thd;
@ -1585,7 +1634,6 @@ public:
List<Item> *values, enum_duplicates handle_duplicates);
~multi_update();
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
bool initialize_tables (JOIN *join);
void send_error(uint errcode,const char *err);
@ -1605,7 +1653,7 @@ public:
~my_var() {}
};
class select_dumpvar :public select_result {
class select_dumpvar :public select_result_interceptor {
ha_rows row_count;
public:
List<my_var> var_list;
@ -1614,7 +1662,6 @@ public:
select_dumpvar(void) { var_list.empty(); local_vars.empty(); vars.empty(); row_count=0;}
~select_dumpvar() {}
int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
bool send_fields(List<Item> &list, uint flags) { return 0; }
bool send_data(List<Item> &items);
bool send_eof();
void cleanup();