Alexander Korotkov ec63622c03 Fix usage of the parse tree for estimate_num_groups() in set operations ...

recurse_set_operations() uses the parse tree for the group number estimation,
because of the "varno 0" hack.  At the same time 2489d76c49 made root->parse
and corresponding parent_root->simple_rte_array[]->subquery distinct copies
of the parse tree, while d3d55ce571 introduced self-join removal replacing
relid of removed relation only in one of the copies.

The present commit fixes this bug by making recurse_set_operations() call
estimate_num_groups() with the copy of the parse tree processed by self-join
removal.

In future, we may think about maintaining just one copy of the parse tree
and/or keeping removed relids as aliases.

Reported-by: Zuming Jiang
Bug: #18170
Discussion: https://postgr.es/m/flat/18170-f1d17bf9a0d58b24%40postgresql.org
Author: Richard Guo, Alexander Korotkov
Reviewed-by: Andrei Lepikhov

2023-11-04 03:30:18 +02:00

..

Makefile

…

meson.build

Update copyright for 2023

2023-01-02 15:00:37 -05:00

prepagg.c

Allow parallel aggregate on string_agg and array_agg

2023-01-23 17:35:01 +13:00

prepjointree.c

Fix another cause of "wrong varnullingrels" planner failures.

2023-06-20 11:09:56 -04:00

prepqual.c

Update copyright for 2023

2023-01-02 15:00:37 -05:00

preptlist.c

Fix incorrect comment in preptlist.c

2023-03-22 08:58:13 +13:00

prepunion.c

Fix usage of the parse tree for estimate_num_groups() in set operations

2023-11-04 03:30:18 +02:00