Re: IN list processing performance (yet again)

> Also, IN (subquery) is a known performance problem in PGSQL, at least if
the subquery is going to return > many rows.
> It's too bad, since I'm rather fond of subqueries, but I avoid them like
the plague in PostgreSQL.

You're not really using a subquery - really just a long list of integers.
Subqueries are lightning fast, so long as you conver to the EXISTS form:

SELECT * FROM tab WHERE id IN (SELECT id2 FROM tab2);

converts to:

SELECT * FROM tab WHERE EXISTS (SELECT id2 FROM tab2 WHERE id2=id);

Chris