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Fixed many problems in the code of With_element::check_unrestricted_recursive().

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Added the check whether there are set functions in the specifications of recursive CTE.
Added the check whether there are recursive references in subqueries.
Introduced boolean system variable 'standards_compliant_cte'. By default it's set to 'on'.
When it's set to 'off' non-standard compliant CTE can be executed.
This commit is contained in:
Galina Shalygina
2016-05-19 22:07:53 +03:00
parent 3b47632bfc
commit 46a2e41398
13 changed files with 675 additions and 52 deletions
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3
sql/sql_lex.cc
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@@ -3189,6 +3189,8 @@ void st_select_lex_unit::set_limit(st_select_lex *sl)
bool st_select_lex_unit::union_needs_tmp_table()
{
if (with_element && with_element->is_recursive)
return true;
return union_distinct != NULL ||
global_parameters()->order_list.elements != 0 ||
thd->lex->sql_command == SQLCOM_INSERT_SELECT ||
@@ -4236,6 +4238,7 @@ void st_select_lex::update_correlated_cache()
while ((tl= ti++))
{
// is_correlated|= tl->is_with_table_recursive_reference();
if (tl->on_expr)
is_correlated|= MY_TEST(tl->on_expr->used_tables() & OUTER_REF_TABLE_BIT);
for (TABLE_LIST *embedding= tl->embedding ; embedding ;