> > >As for NULL,it seems possible to look up NULL keys in a btree index
> > >because NULL == NULL for btree indexes.
> > >I've wondered why PostgreSQL's planner/executor never looks up
> > >indexes for queries using 'IS NULL'.
> >
> > Unfortunately for the RI MATCH PARTIAL case, NULL is a "wildcard".
> >
>
> Oops I misunderstood NULL.
>
> Hmm,is the following TODO worth the work ?
> * Use index to restrict rows returned by multi-key index when used with
> non-consecutive keys or OR clauses, so fewer heap accesses.
This is a Vadim item.
-- Bruce Momjian | http://www.op.net/~candle pgman@candle.pha.pa.us | (610)
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