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Fixed MDEV-14883 Usage of EXCEPT and INTERSECT in recursive CTE

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is not supported

Allowed to use recursive references in derived tables.
As a result usage of recursive references in operands of
INTERSECT / EXCEPT is now supported.
This commit is contained in:
Igor Babaev
2018-02-22 10:08:49 -08:00
parent 988ec800ed
commit 907b236112
9 changed files with 464 additions and 22 deletions
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24
sql/sql_union.cc
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@ -1365,7 +1365,15 @@ bool st_select_lex_unit::exec()
DBUG_RETURN(saved_error);
if (union_result)
{
union_result->init();
if (uncacheable & UNCACHEABLE_DEPENDENT &&
union_result->table && union_result->table->is_created())
{
union_result->table->file->ha_delete_all_rows();
union_result->table->file->ha_enable_indexes(HA_KEY_SWITCH_ALL);
}
}
if (uncacheable || !item || !item->assigned() || describe)
{
@ -1663,6 +1671,20 @@ bool st_select_lex_unit::exec_recursive()
for (st_select_lex *sl= start ; sl != end; sl= sl->next_select())
{
if (with_element->level)
{
for (TABLE_LIST *derived= with_element->derived_with_rec_ref.first;
derived;
derived= derived->next_with_rec_ref)
{
if (derived->is_materialized_derived())
{
if (derived->table->is_created())
derived->table->file->ha_delete_all_rows();
derived->table->reginfo.join_tab->preread_init_done= false;
}
}
}
thd->lex->current_select= sl;
if (sl->tvc)
sl->tvc->exec(sl);
@ -1706,7 +1728,7 @@ bool st_select_lex_unit::exec_recursive()
if (!with_element->rec_result->first_rec_table_to_update)
with_element->rec_result->first_rec_table_to_update= rec_table;
if (with_element->level == 1 && rec_table->reginfo.join_tab)
rec_table->reginfo.join_tab->preread_init_done= true;
rec_table->reginfo.join_tab->preread_init_done= true;
}
for (Item_subselect *sq= with_element->sq_with_rec_ref.first;
sq;