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MDEV-334: Backport of UNION ALL optimization from mysql-5.7.

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Although the original code of mysql-5.7 was adjusted
to the current MariaDB code the main ideas of the optimization
were preserved.
This commit is contained in:
Igor Babaev
2014-10-14 09:36:50 -07:00
parent fec5ab5a56
commit 3c4bb0e872
31 changed files with 853 additions and 327 deletions
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4
sql/sql_derived.cc
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@ -788,7 +788,7 @@ bool mysql_derived_optimize(THD *thd, LEX *lex, TABLE_LIST *derived)
if (!derived->is_merged_derived())
{
JOIN *join= first_select->join;
unit->set_limit(unit->global_parameters);
unit->set_limit(unit->global_parameters());
unit->optimized= TRUE;
if ((res= join->optimize()))
goto err;
@ -905,7 +905,7 @@ bool mysql_derived_fill(THD *thd, LEX *lex, TABLE_LIST *derived)
}
else
{
unit->set_limit(unit->global_parameters);
unit->set_limit(unit->global_parameters());
if (unit->select_limit_cnt == HA_POS_ERROR)
first_select->options&= ~OPTION_FOUND_ROWS;