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Fixed the problem of wrong identification of WITH tables defined in WITH clauses without RECURSIVE.

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Added test cases to check the fix.
Fixed the problem of wrong types of recursive tables when the type of anchor part does not coincide with the
type of recursive part.
Prevented usage of marerialization and subquery cache for subqueries with recursive references.
Introduced system variables 'max_recursion_level'.
Added a test case to test usage of this variable.
This commit is contained in:
Galina Shalygina
2016-05-24 21:29:52 +03:00
parent 0f7fe2a743
commit b4f1f42062
16 changed files with 493 additions and 143 deletions
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4
sql/opt_subselect.cc
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@@ -512,6 +512,7 @@ bool is_materialization_applicable(THD *thd, Item_in_subselect *in_subs,
(Subquery is correlated to the immediate outer query &&
Subquery !contains {GROUP BY, ORDER BY [LIMIT],
aggregate functions}) && subquery predicate is not under "NOT IN"))
5. Subquery does not contain recursive references
A note about prepared statements: we want the if-branch to be taken on
PREPARE and each EXECUTE. The rewrites are only done once, but we need
@@ -528,7 +529,8 @@ bool is_materialization_applicable(THD *thd, Item_in_subselect *in_subs,
OPTIMIZER_SWITCH_PARTIAL_MATCH_ROWID_MERGE) || //3
optimizer_flag(thd,
OPTIMIZER_SWITCH_PARTIAL_MATCH_TABLE_SCAN)) && //3
!in_subs->is_correlated) //4
!in_subs->is_correlated && //4
!in_subs->with_recursive_reference) //5
{
return TRUE;
}