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Don't try to open temporary tables if there are no temporary tables.

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This was done to increase performance when not using temporary tables
as checking if a table is a temporary table involves a lot of code.
This commit is contained in:
Monty 2020-04-06 15:41:33 +03:00
parent f9f33b85be
commit 91ffdc8380
4 changed files with 21 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
sql/sql_base.cc
View File

@ -3691,9 +3691,9 @@ open_and_process_table(THD *thd, TABLE_LIST *tables, uint *counter, uint flags,
The problem is that since those attributes are not set in merge
children, another round of PREPARE will not help.
*/
error= thd->open_temporary_table(tables);
if (!error && !tables->table)
if (!thd->has_temporary_tables() ||
(!(error= thd->open_temporary_table(tables)) &&
!tables->table))
error= open_table(thd, tables, ot_ctx);
thd->pop_internal_handler();
@ -3710,9 +3710,9 @@ open_and_process_table(THD *thd, TABLE_LIST *tables, uint *counter, uint flags,
Repair_mrg_table_error_handler repair_mrg_table_handler;
thd->push_internal_handler(&repair_mrg_table_handler);
error= thd->open_temporary_table(tables);
if (!error && !tables->table)
if (!thd->has_temporary_tables() ||
(!(error= thd->open_temporary_table(tables)) &&
!tables->table))
error= open_table(thd, tables, ot_ctx);
thd->pop_internal_handler();
@ -3727,7 +3727,8 @@ open_and_process_table(THD *thd, TABLE_LIST *tables, uint *counter, uint flags,
still might need to look for a temporary table if this table
list element corresponds to underlying table of a merge table.
*/
error= thd->open_temporary_table(tables);
if (thd->has_temporary_tables())
error= thd->open_temporary_table(tables);
}
if (!error && !tables->table)

2
sql/sql_class.h
View File

@ -4851,6 +4851,7 @@ public:
TMP_TABLE_ANY
};
bool has_thd_temporary_tables();
bool has_temporary_tables();
TABLE *create_and_open_tmp_table(LEX_CUSTRING *frm,
const char *path,
@ -4889,7 +4890,6 @@ private:
/* Whether a lock has been acquired? */
bool m_tmp_tables_locked;
bool has_temporary_tables();
uint create_tmp_table_def_key(char *key, const char *db,
const char *table_name);
TMP_TABLE_SHARE *create_temporary_table(LEX_CUSTRING *frm,

4
sql/sql_cte.cc
View File

@ -834,6 +834,7 @@ st_select_lex_unit *With_element::clone_parsed_spec(THD *thd,
st_select_lex_unit *res= NULL;
Query_arena backup;
Query_arena *arena= thd->activate_stmt_arena_if_needed(&backup);
bool has_tmp_tables;
if (!(lex= (LEX*) new(thd->mem_root) st_lex_local))
{
@ -879,11 +880,12 @@ st_select_lex_unit *With_element::clone_parsed_spec(THD *thd,
spec_tables= lex->query_tables;
spec_tables_tail= 0;
has_tmp_tables= thd->has_temporary_tables();
for (TABLE_LIST *tbl= spec_tables;
tbl;
tbl= tbl->next_global)
{
if (!tbl->derived && !tbl->schema_table &&
if (has_tmp_tables && !tbl->derived && !tbl->schema_table &&
thd->open_temporary_table(tbl))
goto err;
spec_tables_tail= tbl;

13
sql/temporary_tables.cc
View File

@ -338,9 +338,11 @@ bool THD::open_temporary_table(TABLE_LIST *tl)
have invalid db or table name.
Instead THD::open_tables() should be used.
*/
DBUG_ASSERT(!tl->derived && !tl->schema_table);
DBUG_ASSERT(!tl->derived);
DBUG_ASSERT(!tl->schema_table);
DBUG_ASSERT(has_temporary_tables());
if (tl->open_type == OT_BASE_ONLY || !has_temporary_tables())
if (tl->open_type == OT_BASE_ONLY)
{
DBUG_PRINT("info", ("skip_temporary is set or no temporary tables"));
DBUG_RETURN(false);
@ -452,10 +454,13 @@ bool THD::open_temporary_table(TABLE_LIST *tl)
*/
bool THD::open_temporary_tables(TABLE_LIST *tl)
{
TABLE_LIST *first_not_own;
DBUG_ENTER("THD::open_temporary_tables");
TABLE_LIST *first_not_own= lex->first_not_own_table();
if (!has_temporary_tables())
DBUG_RETURN(0);
first_not_own= lex->first_not_own_table();
for (TABLE_LIST *table= tl; table && table != first_not_own;
table= table->next_global)
{
@ -868,7 +873,7 @@ void THD::restore_tmp_table_share(TMP_TABLE_SHARE *share)
@return false Temporary tables exist
true No temporary table exist
*/
inline bool THD::has_temporary_tables()
bool THD::has_temporary_tables()
{
DBUG_ENTER("THD::has_temporary_tables");
bool result= (rgi_slave