Re: eliminating records not in (select id ... so SLOW?

Ivan Sergio Borgonovo <mail@webthatworks.it> writes:
> Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Huh.  The only way I can see for that to happen is if the datatypes
>> involved aren't hashable.  What's the datatypes of the two columns
>> being compared, anyway?

> thanks to svn I'd say you're right... one column was int the other
> bigint.

Ah.  8.3 can hash certain cross-type comparisons (including that one)
but prior versions won't.

            regards, tom lane