Re: ERROR: functions in index expression must be marked IMMUTABLE

On 27.02.2017 18:17, Adrian Klaver wrote:
> Yes, but is not about timezone dependency, it is about the other
> dependencies listed in the second and third points. Namely the
> datestyle setting and magic strings e.g. 'now'

I am sorry, I still don't understand. to_date and to_timestamp require
datestyle settings per se and magic strings don't work.

=# -- required datestyle
=# select to_date('2000-01-01');
ERROR: function to_date(unknown) does not exist
LINE 1: select to_date('2000-01-01');
^
HINT: No function matches the given name and argument types. You might
need to add explicit type casts.

=# -- magic strings don't work
=# select to_date('');
ERROR: invalid value "epoc" for "YYYY"
DETAIL: Value must be an integer.
=# select to_date('epoch', 'YYYY-MM-DD');
ERROR: invalid value "epoc" for "YYYY"
DETAIL: Value must be an integer.
=# select to_date('infinity', 'YYYY-MM-DD');
ERROR: invalid value "infi" for "YYYY"
DETAIL: Value must be an integer.
=# select to_date('-infinity', 'YYYY-MM-DD');
ERROR: invalid value "-inf" for "YYYY"
DETAIL: Value must be an integer.
=# select to_date('now', 'YYYY-MM-DD');
ERROR: invalid value "now" for "YYYY"
DETAIL: Value must be an integer.
=# select to_date('today', 'YYYY-MM-DD');
ERROR: invalid value "toda" for "YYYY"
DETAIL: Value must be an integer.
=# select to_date('tomorrow', 'YYYY-MM-DD');
ERROR: invalid value "tomo" for "YYYY"
DETAIL: Value must be an integer.
=# select to_date('yesterday', 'YYYY-MM-DD');
ERROR: invalid value "yest" for "YYYY"
DETAIL: Value must be an integer.
=# select to_date('allballs', 'YYYY-MM-DD');
ERROR: invalid value "allb" for "YYYY"
DETAIL: Value must be an integer.

Regards,
Sven