Re: Immutable way to cast timestamp TEXT to DATE? (for index)

Поиск

Список

Период

Сортировка

От	Ken Tanzer
Тема	Re: Immutable way to cast timestamp TEXT to DATE? (for index)
Дата	5 января 2019 г. 01:37:55
Msg-id	CAD3a31W0naEvCV8b3r+wbfO6sPc9Ay6rnWUVgS6dYvV4RkAE5w@mail.gmail.com обсуждение исходный текст
Ответ на	Re: Immutable way to cast timestamp TEXT to DATE? (for index) (Adrian Klaver <adrian.klaver@aklaver.com>)
Список	pgsql-general

Дерево обсуждения

On Fri, Jan 4, 2019 at 2:27 PM Adrian Klaver <adrian.klaver@aklaver.com> wrote:

On 1/4/19 2:21 PM, Ken Tanzer wrote:
>
> I've tried various ways of getting to a date (::date, LEFT(x,10)::date,
> etc.), but all of them throw the error "functions in index expression
> must be marked IMMUTABLE."

?:
'2014-10-23T00:00:00'::timestamp

Can you also show the actual index expression?

Here's a few of the ones I tried:

ag_reach=> CREATE INDEX ON export_hch_encounter_history (CAST("Service_Date" AS date));
ERROR:  functions in index expression must be marked IMMUTABLE
ag_reach=> CREATE INDEX ON export_hch_encounter_history (CAST(LEFT("Service_Date",10) AS date));
ERROR:  functions in index expression must be marked IMMUTABLE
ag_reach=> CREATE INDEX ON export_hch_encounter_history (CAST("Service_Date"::timestamp AS date));
ERROR:  functions in index expression must be marked IMMUTABLE
ag_reach=> CREATE INDEX ON export_hch_encounter_history (("Service_Date"::date));
ERROR:  functions in index expression must be marked IMMUTABLE
ag_reach=> CREATE INDEX ON export_hch_encounter_history ((LEFT("Service_Date",10)::date));
ERROR:  functions in index expression must be marked IMMUTABLE