Re: is date_part immutable or not?

On Fri, 2020-08-21 at 14:57 +0300, Олег Самойлов wrote:
> Just create partitioned table for PostgreSQL logs
> 
> CREATE TABLE pglog.pglog (
>    log_time timestamp(3) with time zone,
> [...]
> ) PARTITION BY LIST (date_part('isodow', log_time));
> 
> ERROR:  functions in partition key expression must be marked IMMUTABLE

Two approaches:

1. Use "timestamp without time zone".

2. Partition in some other way, for example BY RANGE (log_time).
   Your list partitions don't make a lot of sense to me.

Yours,
Laurenz Albe
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