On 26 February 2017 at 10:09, Sven R. Kunze <srkunze@mail.de> wrote:
>>># create index docs_birthdate_idx ON docs using btree (((meta->>'birthdate')::date)); ERROR: functions in index expression must be marked IMMUTABLE So, what is the problem here?
Date functions are inherently not immutable because of timezones. Your solution of using to_timestamp doesn't help because it automatically returns a value in WITH TIMESTAMP. Do you get anywhere by using "::timestamp without time zone" instead, as suggested here?
