On Wed, 20 Aug 2003, Rod Taylor wrote:
Ensure your IN list is unique. You might find better times by through an indexed temp table.
That is what I ended up doing, but it's not a very elegant solution. MySQL does queries of this type orders of magnitudes faster than Postgres on large value lists, although I have no specific algorithmic solutions to offer for how to make it faster. I don't believe making the IN lists unique has any affect on performance.
I have no idea whether it will be better or worse performance, but in 7.4 you could do:
select blah from foo where id = any (ARRAY[list_of_literals]);
Joe
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