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Revert "Propagate CTE property flags when copying a CTE list into a rule."

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This reverts commit ed290896335414c6c069b9ccae1f3dcdd2fac6ba and
equivalent back-branch commits.  The issue is subtler than I thought,
and it's far from new, so just before a release deadline is no time
to be fooling with it.  We'll consider what to do at a bit more
leisure.

Discussion: https://postgr.es/m/CAJcOf-fAdj=nDKMsRhQzndm-O13NY4dL6xGcEvdX5Xvbbi0V7g@mail.gmail.com
This commit is contained in:
Tom Lane 2021-02-07 12:54:08 -05:00
parent 9c89c4bd8d
commit ac1df003f2
3 changed files with 0 additions and 49 deletions
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6
src/backend/rewrite/rewriteHandler.c
View File

@ -530,9 +530,6 @@ rewriteRuleAction(Query *parsetree,
*
* This could possibly be fixed by using some sort of internally
* generated ID, instead of names, to link CTE RTEs to their CTEs.
* However, decompiling the results would be quite confusing; note the
* merge of hasRecursive flags below, which could change the apparent
* semantics of such redundantly-named CTEs.
*/
foreach(lc, parsetree->cteList)
{
@ -554,9 +551,6 @@ rewriteRuleAction(Query *parsetree,
/* OK, it's safe to combine the CTE lists */
sub_action->cteList = list_concat(sub_action->cteList,
copyObject(parsetree->cteList));
/* ... and don't forget about the associated flags */
sub_action->hasRecursive |= parsetree->hasRecursive;
sub_action->hasModifyingCTE |= parsetree->hasModifyingCTE;
}
/*

27
src/test/regress/expected/with.out
View File

@ -1672,33 +1672,6 @@ SELECT * FROM bug6051_2;
3
(3 rows)
-- silly example to verify that hasModifyingCTE flag is propagated
CREATE TEMP TABLE bug6051_3 AS
select a from generate_series(11,13) as a;
CREATE RULE bug6051_3_ins AS ON INSERT TO bug6051_3 DO INSTEAD
SELECT i FROM bug6051_2;
BEGIN; SET LOCAL force_parallel_mode = on;
WITH t1 AS ( DELETE FROM bug6051_3 RETURNING * )
INSERT INTO bug6051_3 SELECT * FROM t1;
i
---
1
2
3
1
2
3
1
2
3
(9 rows)
COMMIT;
SELECT * FROM bug6051_3;
a
---
(0 rows)
-- a truly recursive CTE in the same list
WITH RECURSIVE t(a) AS (
SELECT 0

16
src/test/regress/sql/with.sql
View File

@ -773,22 +773,6 @@ INSERT INTO bug6051 SELECT * FROM t1;
SELECT * FROM bug6051;
SELECT * FROM bug6051_2;
-- silly example to verify that hasModifyingCTE flag is propagated
CREATE TEMP TABLE bug6051_3 AS
select a from generate_series(11,13) as a;
CREATE RULE bug6051_3_ins AS ON INSERT TO bug6051_3 DO INSTEAD
SELECT i FROM bug6051_2;
BEGIN; SET LOCAL force_parallel_mode = on;
WITH t1 AS ( DELETE FROM bug6051_3 RETURNING * )
INSERT INTO bug6051_3 SELECT * FROM t1;
COMMIT;
SELECT * FROM bug6051_3;
-- a truly recursive CTE in the same list
WITH RECURSIVE t(a) AS (
SELECT 0