> CREATE INDEX b_is_null ON mock(a) WHERE b IS NULL;
> where a is chosen as a column that you frequently also test in
> conjunction with "b IS NULL".  That is, the above index can efficiently
> handle queries like
>       ... WHERE a = 42 AND b IS NULL ...

This is wonderful, it seems like most of our problems (probably also
regarding the "index on timestamp"-thread I started separately) can be
solved with partial indexing on expressions.  No need to hide under
bedclothes anymore ;-)

Tobias Brox, Beijing

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