[Tobias Brox - Tue at 11:02:07AM +0800]
> I read in the manual today:
>   Indexes are not used for IS NULL clauses by default. The best way to use
>   indexes in such cases is to create a partial index using an IS NULL
>   predicate.

I have summarized this thread in a postgresql doc user comment, posted at

I think it's a good thing to do, since it can be difficult to search the
mailing list archives :-)

Tobias Brox, Beijing

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