On Mon, Feb 19, 2007 at 10:36:36AM +0100, Karsten Hilbert wrote: > On Mon, Feb 19, 2007 at 10:16:12AM +0100, Alban Hertroys wrote: > > > What I'm trying to say is not that it _is_ immutable, but that it > > _behaves_ immutable (under said conditions). > > > > This could imply that if a certain condition is available in a query on > > which such a function operates, it would behave immutable. > That is precisely why I didn't get the idea upfront that > date_trunc() wouldn't be immutable just so. > > I'll solve it with a date_trunc_utc() wrapper. It should be noted the date_truc(timestamptz) is not immutable, whereas date_trunc(timestamp) is. Thus you should be able to make an index on: date_trunc( timestamptz_column AT TIME ZONE 'UTC', 'foo' ) OTOH, if you're only storing times in UTC, then timestamp without timezone might be better anyway. 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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