From: Tom Lane <tgl@sss.pgh.pa.us>
To: Braiam <braiamp@gmail.com>
Cc: braiamp+pg@gmail.com
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18007: age(timestamp, timestamp) is marked as immutable, but using age(date, date) says it's not
Date: Thu, 29 Jun 2023 14:24:47 -0400
Message-ID: <1576665.1688063087@sss.pgh.pa.us> (raw)
In-Reply-To: <CAG=7Bt_DtoMoAA7iKCgYvV2Np1Xv1K29QKGggihnt04WSrAKfQ@mail.gmail.com>
References: <18007-036782307e002bf6@postgresql.org>
<1573129.1688061162@sss.pgh.pa.us>
<CAG=7Bt_DtoMoAA7iKCgYvV2Np1Xv1K29QKGggihnt04WSrAKfQ@mail.gmail.com>
Braiam <braiamp@gmail.com> writes:
> On Thu, Jun 29, 2023 at 1:52 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> There is no age(date, date) function. What we have is age(timestamp,
>> timestamp) and age(timestamptz, timestamptz), so the parser has to
>> choose which type to coerce to --- and it prefers timestamptz.
> According to \df+ age both timestamptz and timestamp are immutable:
True, but not very relevant: it's the coercion from date that's
giving you trouble.
> So, whatever type is coerced into pre-function evaluation comes
> with strange results. I'm not aware of a way that I can see what
> kind of type is being coerced into.
EXPLAIN will show that, eg
=# explain verbose select age(current_date, current_date);
QUERY PLAN
---------------------------------------------------------------------------------------------------
Result (cost=0.00..0.02 rows=1 width=16)
Output: age((CURRENT_DATE)::timestamp with time zone, (CURRENT_DATE)::timestamp with time zone)
(2 rows)
regards, tom lane
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To: pgsql-bugs@postgresql.org
Cc: tgl@sss.pgh.pa.us, braiamp@gmail.com, braiamp+pg@gmail.com, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18007: age(timestamp, timestamp) is marked as immutable, but using age(date, date) says it's not
In-Reply-To: <1576665.1688063087@sss.pgh.pa.us>
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