On Wed, 25 May 2022 at 12:51, Michael Paquier <michael@paquier.xyz> wrote: > > On Tue, May 24, 2022 at 04:17:35PM +0000, PG Bug reporting form wrote: > > From testing with 15beta1, I think there is a regression in filtering a > > subquery using the result of the row_number window function. Here is the > > code: > > > > This was discovered by the tests for Sequel, a Ruby database access > > library. > > Inconsistency reproduced here, thanks for the detailed report and the > test case! I have added an open item: > https://wiki.postgresql.org/wiki/PostgreSQL_15_Open_Items
Thanks for adding. I've put myself as the owner of this and will look at it soon.
This should be introduced in by 9d9c02cc. The rel of the subquery loses
its baserestrictinfo, which is (x_sequel_row_number_x <= 2), when generating SubqueryScan access paths for it. As a result, the WindowFunc target entry is removed as an unused targetlist item.
