Hello Alexander,
23.10.2023 12:47, Alexander Korotkov wrote:
I think this patch makes substantial improvement to query planning.
It has received plenty of reviews. The code is currently in quite
good shape. I didn't manage to find the cases when this optimization
causes significant overhead to planning time. Even if such cases will
be spotted there is a GUC option to disable this feature. So, I'll
push this if there are no objections.
I've discovered another failure, introduced by d3d55ce57.
Please try the following:
CREATE TABLE t (a int unique, b float);
SELECT * FROM t NATURAL JOIN LATERAL
(SELECT * FROM t t2 TABLESAMPLE SYSTEM (t.b)) t2;
With asserts enabled, it triggers
TRAP: failed Assert("!bms_is_member(rti, lateral_relids)"), File:
"initsplan.c", Line: 697, PID: 3074054
ExceptionalCondition at assert.c:52:13
create_lateral_join_info at initsplan.c:700:8
query_planner at planmain.c:257:2
grouping_planner at planner.c:1523:17
subquery_planner at planner.c:1098:2
standard_planner at planner.c:415:9
planner at planner.c:282:12
pg_plan_query at postgres.c:904:9
pg_plan_queries at postgres.c:996:11
exec_simple_query at postgres.c:1193:19
PostgresMain at postgres.c:4684:27
With no asserts, I get:
ERROR: failed to construct the join relation
Please take a look at this.
Best regards,
Alexander
