Re: BUG #17871: JIT during postgresql_fdw remote_estimates EXPLAIN have very negatively effect on planning time

On Tue, 28 Mar 2023 at 17:54, Maxim Boguk <maxim(dot)boguk(at)gmail(dot)com> wrote:
> During an attempt to create a minimal test case I discovered an effect for which I have no explanation:
> (all tests with jit=on):
>
> Run EXPLAIN on the single partition, so far expected results...
> explain select * from interview_review_info_archive_p028;
> QUERY PLAN
> -----------------------------------------------------------------------------------------------
> Seq Scan on interview_review_info_archive_p028 (cost=0.00..361819.08 rows=34546848 width=40)
> JIT:
> Functions: 2
> Options: Inlining true, Optimization true, Expressions true, Deforming true

It could be something like a dropped column forcing projection of the
SELECT *. You might want to try without SELECT * using some subset of
columns instead.

Check if columns have been dropped with:

select attnum,attname from pg_Attribute where
attrelid='interview_review_info_archive_p028'::Regclass;

David