(login_time at time zone 'GMT')::date
but upon experimenting I see that that isn't considered immutable either
:-(. Offhand I think this may be an oversight --- I can't see any reason
for the various flavors of AT TIME ZONE (a/k/a timezone() function)
not to be considered immutable.
Gaetano Mendola [EMAIL PROTECTED] writes:
consider that login_time is a TIMESTAMPTZ with an index on it.
test# create index idx on user_logs ( (login_time::date) );
ERROR: functions in index expression must be marked IMMUTABLE
why that cast is not considered IMMUTABLE ?
Because it depends
