No. Postgres has in-memory bitmap indexes, which are built on the fly while scanning the index and used to more efficiently combine AND/OR clauses, but that's n

No. Postgres has in-memory bitmap indexes, which are built on the fly while scanning the index and used to more efficiently combine AND/OR clauses, but that's not quite the same thing. There have been several attempts at adding on-disk bitmap index support to Postgres, but they've all been abandoned.