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help / color / mirror / Atom feedFrom: Rumpi Gravenstein <[email protected]>
To: Tom Lane <[email protected]>
To: PostgreSQL <[email protected]>
Subject: Re: Analytic Function Bug
Date: Fri, 30 Aug 2024 07:37:15 -0400
Message-ID: <CAEpg1wAyaMmYYgCLm1Ohft50SCiuhgMRRr0u880wAkyFxpbs6w@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CAEpg1wDJU6DzUJxJdFAUZFzmw6bY+p17bXvCLupwsxc0V6vqrg@mail.gmail.com>
<[email protected]>
<snip>
that the lag() functions are seeing some rows that don't show up in
the final output.
</snip>
I'm under the impression that the predicate filter is applied before the
analytic is evaluated. Are you suggesting that I have this wrong -- the
analytic is evaluated and then the filter is applied?
On Thu, Aug 29, 2024 at 8:07 PM Tom Lane <[email protected]> wrote:
> Rumpi Gravenstein <[email protected]> writes:
> > Is this a PostgreSQL bug?
>
> Maybe, but you haven't provided enough information to let anyone else
> reproduce the behavior.
>
> Personally I'm suspicious that because your lag() calls are over
>
> partition by p.logical_partition_key, p.txt order by indx
>
> but then you filter by
>
> where logical_partition_key='TEST_DATA' and
> usage_text='F(T61)(EXPORT)';
>
> that the lag() functions are seeing some rows that don't show up in
> the final output. (This'd require that some output rows from "parse"
> share txt values but not usage_text values, but that certainly looks
> like it's possible.) So IMO you have not actually demonstrated that
> there is any bug.
>
> regards, tom lane
>
--
Rumpi Gravenstein
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Subject: Re: Analytic Function Bug
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