From: | Guillaume Lelarge <guillaume(at)lelarge(dot)info> |
---|---|
To: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
Cc: | PostgreSQL General <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Weird behaviour of ROLLUP/GROUPING |
Date: | 2019-01-16 17:05:39 |
Message-ID: | CAECtzeWeLfm3_VOg5RzNVAgh5Zs051qrkoOmMZTk65cS_tZ8PA@mail.gmail.com |
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Lists: | pgsql-general |
Le mer. 16 janv. 2019 à 17:40, Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk>
a écrit :
> >>>>> "Andrew" == Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> writes:
> >>>>> "Guillaume" == Guillaume Lelarge <guillaume(at)lelarge(dot)info> writes:
>
> Guillaume> CASE grouping(to_char(b, 'MMYYYY'))
>
> Guillaume> ERROR: arguments to GROUPING must be grouping expressions of
> the
> Guillaume> associated query level
> Guillaume> LINE 3: CASE grouping(to_char(b, 'MMYYYY')) WHEN 1 THEN 'some
> date' ...
>
> Guillaume> AFAICT, both queries should behave the same, though their
> Guillaume> actual behaviours are quite opposite. Working fine for the
> Guillaume> first, erroring out on the second.
>
> Guillaume> Does anyone has any idea what's going on here?
>
> Andrew> Not yet. But I will find out, since it seems to be a bug.
>
> It is definitely a bug, to do with assignment of collations. It
> specifically happens when you use GROUPING which contains any
> subexpression of a collatable type, inside a CASE expr WHEN clause,
> since that assigns collations to the expression much earlier in parsing
> than the rest of the query, so the code that validates GROUPING ends up
> trying to compare an expression which has had collations assigned to it
> to one which has not, and so it thinks they differ.
>
> I will see about fixing this, somehow.
>
>
Thanks a lot.
--
Guillaume.
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