Re: sequential scan on select distinct

Greg Stark <gsstark@mit.edu> writes:
> why isn't a "skip index scan" plan available? Well, nobody's written the code
> yet.

I don't really think it would be a useful plan anyway.  What *would* be
useful is to support HashAggregate as an implementation alternative for
DISTINCT --- currently I believe we only consider that for GROUP BY.
The DISTINCT planning code is fairly old and crufty and hasn't been
redesigned lately.

            regards, tom lane