From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | jian he <jian(dot)universality(at)gmail(dot)com>, Francisco Olarte <folarte(at)peoplecall(dot)com>, Michael Bondarenko <work(dot)michael(dot)2956(at)gmail(dot)com>, pgsql-bugs(at)lists(dot)postgresql(dot)org, dgrowleyml(at)gmail(dot)com, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com> |
Subject: | Re: BUG #18348: Inconsistency with EXTRACT([field] from INTERVAL); |
Date: | 2024-08-16 16:15:58 |
Message-ID: | Zr97Pqkx9J_BbZHt@momjian.us |
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Lists: | pgsql-bugs pgsql-hackers |
On Fri, Aug 16, 2024 at 12:06:35PM -0400, Tom Lane wrote:
> regression=# select n, extract(quarter from interval '1 mon' * n) from generate_series(-12,12) n;
> n | extract
> -----+---------
> -12 | 1
> -11 | -2
> -10 | -2
> -9 | -2
Wow, that "1" is weird to see.
> which is fine on the positive side but it's hard to describe the
> results for negative months as anything but wacko. The v2 patch
> gives
>
> regression=# select n, extract(quarter from interval '1 mon' * n) from generate_series(-12,12) n;
> n | extract
> -----+---------
> -12 | -1
> -11 | -4
> -10 | -4
> -9 | -4
> -8 | -3
> -7 | -3
> -6 | -3
> -5 | -2
> -4 | -2
> -3 | -2
> -2 | -1
> -1 | -1
> 0 | 1
> 1 | 1
> 2 | 1
> 3 | 2
> 4 | 2
> 5 | 2
> 6 | 3
> 7 | 3
> 8 | 3
> 9 | 4
> 10 | 4
> 11 | 4
> 12 | 1
> (25 rows)
>
> which is a whole lot saner. So let's run with v2.
Yes, that v2 output looks very clean. I had to really dig my head into
this so I am not surprised it was confusing to find the right solution.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
Only you can decide what is important to you.
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