On 2012-01-25, hubert depesz lubaczewski <dep...@depesz.com> wrote: > On Wed, Jan 25, 2012 at 02:07:40PM -0800, Adrian Klaver wrote: >> Finally dawned on me. When you use 'at time zone' on a timestamp >> with tz it strips the tz which then allows the value to be indexed >> because: >> >> -[ RECORD 5 >> ]-------+------------------------------------------------------------------------- >> Schema | pg_catalog >> Name | date_part >> Result data type | double precision >> Argument data types | text, timestamp without time zone >> Type | normal >> Volatility | immutable >> Owner | postgres >> Language | internal >> Source code | timestamp_part >> Description | extract field from timestamp > > yes, but it is not correct - the value is actually stable, and not > immutable.
it's immutable for all date parts except "epoch". epoch is backwards to the other date parts. immutable for timestamptz and stable for timestamp -- ⚂⚃ 100% natural -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
