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_+_tt07ecstkb1loa50f0ust...@mail.gmail.com
-- regards, Andrei Lepikhov Postgres Professional
