Re: Strange query plan

Oleg Bartunov <oleg@sai.msu.su> writes:
> should be
> select msg_prt.tid as mid from msg_prt
>  where exists (select idx.tid from idx where msg_prt.tid=idx.tid
>                and idx.did=1 and ( idx.lid = 1207 or idx.lid=59587 ));
> but this is not a big win.

Shouldn't be any win at all: the IN expression-list notation will get
translated to exactly that form.

> Anyway, what's about original query ?

IN/EXISTS subqueries suck.  This has been true for a long time and is
going to be true for a while longer, unless someone else fixes it before
I have a chance to look at it.  See if you can't rewrite your query as
a plain join.
        regards, tom lane