Hello PostgreSQL Developers,
I am using PostgreSQL 15.3 (Debian 15.3-1.pgdg120+1) on aarch64-unknown-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit.
(In the following X and Y are literals; X <> Y)
I noticed is that…
EXPLAIN SELECT column FROM Table WHERE column = X AND column = Y
…says that PostgreSQL actually wants to perform a Scan!
I wonder why squandering any resources into a Scan here, as it is pretty obvious that the result is guaranteed to be always, under any conditions, and will always be: zero matching rows – at least in a universe where a single value cannot be X AND Y at the same time.
This can be seen as a chance to add an optimization („col = X AND col = Y always is zero matching rows), or in case such an optimization already exists in PostgreSQL, as a bug.
BTW the same happens for column IS NULL AND column = Y.
Regards,
-Markus
