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Merge pull request #1025 from mariadb-corporation/MCOL-3747

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MCOL-3747 This patch properly enables queries with IN + uncorrelated …
This commit is contained in:
David.Hall
2020-02-04 09:41:12 -06:00
committed by Patrick LeBlanc
parent f27cb8a21f
commit 0db52396f9
1 changed files with 23 additions and 1 deletions
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24
dbcon/mysql/ha_mcs_pushdown.cpp
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@ -42,6 +42,26 @@ void disable_indices_for_CEJ(THD *thd_)
}
}
bool optimize_unflattened_subqueries_(SELECT_LEX *select_lex)
{
bool result = false;
TABLE_LIST *tbl;
List_iterator_fast<TABLE_LIST> li(select_lex->leaf_tables);
while (!result && (tbl= li++))
{
if (tbl->is_view_or_derived())
{
SELECT_LEX *dsl = tbl->derived->first_select();
result = optimize_unflattened_subqueries_(dsl);
}
}
result = (!result) ?
select_lex->optimize_unflattened_subqueries(false) : true;
return result;
}
void mutate_optimizer_flags(THD *thd_)
{
// MCOL-2178 Disable all optimizer flags as it was in the fork.
@ -775,7 +795,9 @@ create_columnstore_select_handler(THD* thd, SELECT_LEX* select_lex)
}
COND *conds = simplify_joins_(join, select_lex->join_list, join->conds, TRUE, FALSE);
select_lex->optimize_unflattened_subqueries(false);
// MCOL-3747 IN-TO-EXISTS rewrite inside MDB didn't add
// an equi-JOIN condition.
optimize_unflattened_subqueries_(select_lex);
if (conds)
{