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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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8
sql/sql_select.cc
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@ -816,8 +816,6 @@ JOIN::prepare(TABLE_LIST *tables_init,
&hidden_group_fields,
&select_lex->select_n_reserved))
DBUG_RETURN(-1);
if (select_lex->check_unrestricted_recursive())
DBUG_RETURN(-1);
/* Resolve the ORDER BY that was skipped, then remove it. */
if (skip_order_by && select_lex !=
select_lex->master_unit()->global_parameters())
@ -861,6 +859,12 @@ JOIN::prepare(TABLE_LIST *tables_init,
With_clause *with_clause=select_lex->get_with_clause();
if (with_clause && with_clause->prepare_unreferenced_elements(thd))
DBUG_RETURN(1);
With_element *with_elem= select_lex->get_with_element();
if (with_elem &&
select_lex->check_unrestricted_recursive(
thd->variables.only_standards_compliant_cte))
DBUG_RETURN(-1);
int res= check_and_do_in_subquery_rewrites(this);