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This commit is contained in:
Igor Babaev 2013-11-24 22:10:36 -08:00
commit 3fc7743435
1 changed files with 28 additions and 0 deletions
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28
sql/sql_select.cc
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@ -3618,6 +3618,21 @@ make_join_statistics(JOIN *join, List<TABLE_LIST> &tables_list,
conds=new Item_int((longlong) 0,1);
}
join->conds= conds;
join->cond_equal= NULL;
if (conds)
{
if (conds->type() == Item::COND_ITEM &&
((Item_cond*) conds)->functype() == Item_func::COND_AND_FUNC)
join->cond_equal= (&((Item_cond_and *) conds)->cond_equal);
else if (conds->type() == Item::FUNC_ITEM &&
((Item_func*) conds)->functype() == Item_func::MULT_EQUAL_FUNC)
{
if (!join->cond_equal)
join->cond_equal= new COND_EQUAL;
join->cond_equal->current_level.empty();
join->cond_equal->current_level.push_back((Item_equal*) conds);
}
}
}
/* Calc how many (possible) matched records in each table */
@ -3732,6 +3747,19 @@ make_join_statistics(JOIN *join, List<TABLE_LIST> &tables_list,
if (join->const_tables != join->table_count)
optimize_keyuse(join, keyuse_array);
DBUG_ASSERT(!join->conds || !join->cond_equal ||
!join->cond_equal->current_level.elements ||
(join->conds->type() == Item::COND_ITEM &&
((Item_cond*) (join->conds))->functype() ==
Item_func::COND_AND_FUNC &&
join->cond_equal ==
&((Item_cond_and *) (join->conds))->cond_equal) ||
(join->conds->type() == Item::FUNC_ITEM &&
((Item_func*) (join->conds))->functype() ==
Item_func::MULT_EQUAL_FUNC &&
join->cond_equal->current_level.elements == 1 &&
join->cond_equal->current_level.head() == join->conds));
if (optimize_semijoin_nests(join, all_table_map))
DBUG_RETURN(TRUE); /* purecov: inspected */