Re: [PoC] Reducing planning time when tables have many partitions

On 27/9/2023 14:28, Yuya Watari wrote:
> Thank you for pointing it out. The ec_source_indexes and
> ec_derive_indexes are just picked up from the previous patch, and I
> have not changed their design. I think a similar approach to
> EquivalenceMembers may be applied to RestrictInfos. I will experiment
> with them and share a new patch.

During the work on committing the SJE feature [1], Alexander Korotkov 
pointed out the silver lining in this work [2]: he proposed that we 
shouldn't remove RelOptInfo from simple_rel_array at all but replace it 
with an 'Alias', which will refer the kept relation. It can simplify 
further optimizations on removing redundant parts of the query.

[1] 
https://www.postgresql.org/message-id/flat/64486b0b-0404-e39e-322d-0801154901f3%40postgrespro.ru
[2] 
https://www.postgresql.org/message-id/CAPpHfdsnAbg8CaK+NJ8AkiG_+_Tt07eCStkb1LOa50f0UsT5RQ@mail.gmail.com

-- 
regards,
Andrei Lepikhov
Postgres Professional