On Thu, Jun 01, 2006 at 03:09:47PM +0400, Dan Black wrote: > Hi > I have a stable function test.test_stable <snip> > But if I want to display field sid twice > > SELECT id, sid, sid FROM > (SELECT *, test.test_stable(id) AS sid FROM generate_series(10, 100) AS id) > tbl > > I can see that function test.test_stable executes twice with identical > parameters Postgres makes no special effort to avoid multiple calls of the same function. Especially since you declared it STABLE. > Is it bug or special feature? Not a bug nor a special feature, just the way it is. If you put OFFSET 0 in the subquery, that will stop the expansion of the subquery, thus the function will only be called once. Have a nice day, -- Martijn van Oosterhout <kleptog@xxxxxxxxx> http://svana.org/kleptog/ > From each according to his ability. To each according to his ability to litigate.
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