From: | Joe Conway <mail(at)joeconway(dot)com> |
---|---|
To: | Andres Freund <andres(at)anarazel(dot)de> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: pg_config wrongly marked as not parallel safe? |
Date: | 2018-11-27 00:14:24 |
Message-ID: | ae6446c1-b08a-6e79-8f8e-9269e97f5abb@joeconway.com |
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Lists: | pgsql-hackers |
On 11/26/18 7:08 PM, Andres Freund wrote:
> On 2018-11-26 19:04:46 -0500, Joe Conway wrote:
>> Not intentional. Though, sitting here chatting with Stephen about it, I
>> am now wondering if pg_config() should actually be marked immutable:
>>
>> select * from pg_config() where name = 'VERSION';
>> name | setting
>> ---------+-----------------
>> VERSION | PostgreSQL 10.5
>> (1 row)
>>
>> [...upgrade the postgres binaries...]
>>
>> select * from pg_config() where name = 'VERSION';
>> name | setting
>> ---------+-----------------
>> VERSION | PostgreSQL 10.6
>> (1 row)
>>
>> So the correct answer is probably to mark pg_config() stable, but it
>> still seems to be parallel safe to me.
>
> I don't think we should consider immutability to mean anything across
> major versions. What'd be helped by doing that? We'd have to rule out
> any behaviour change to any immutable function for that to make
> sense. Including making an immutable function not immutable anymore.
Umm, this is a minor version not major.
Joe
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