=?UTF-8?B?U2HFoW8gR2FudGFy?= <sasog23@gmail.com> writes:
> thanks for the info, but is there any solution, given that it's system
> tables?
Given the complexity of the query, I wonder if you're running into
problems with join_collapse_limit/from_collapse_limit preventing
the planner from considering all options.
Also, as David already mentioned, ANALYZE on pg_class might help.
regards, tom lane