PG17 changed how scalar subquery outputs appear in EXPLAIN output (*).
This commit changes impacted regress goldfiles to the PG17 format, and
adds a helper function to covert pre-PG17 plans to the PG17 format. The
conversion is required when testing Citus on pgversions prior to 17. The
helper function can and should be removed when 17 becomes the minimum
supported version.
(*)
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=fd0398fcb
Areas for further optimization:
- Don't save subquery results to a local file on the coordinator when the subquery is not in the having clause
- Push the the HAVING with subquery to the workers if there's a group by on the distribution column
- Don't push down the results to the workers when we don't push down the HAVING clause, only the coordinator needs it
Fixes#520Fixes#756Closes#2047
Colm
naisila
Hanefi Onaldi
Sait Talha Nisanci
Jelte Fennema