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In-Reply-To: <CAMbWs4_imG5C8rXt7xdU7zf6whUDc2rdDun+Vtrowcmxb41CzA@mail.gmail.com>
From: Richard Guo <guofenglinux@gmail.com>
Date: Fri, 2 Feb 2024 17:18:59 +0800
Message-ID: <CAMbWs49Z6TrH4qJuudPx2toeJutPOV1CyvbL3GE1QNg_LaATEg@mail.gmail.com>
Subject: Re: Check lateral references within PHVs for memoize cache keys
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>, David Rowley <dgrowleyml@gmail.com>
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On Mon, Dec 25, 2023 at 3:01=E2=80=AFPM Richard Guo <guofenglinux@gmail.com=
> wrote:

> On Thu, Jul 13, 2023 at 3:12=E2=80=AFPM Richard Guo <guofenglinux@gmail.c=
om>
> wrote:
>
>> So I'm wondering if it'd be better that we move all this logic of
>> computing additional lateral references within PHVs to get_memoize_path,
>> where we can examine only PHVs that are evaluated at innerrel.  And
>> considering that these lateral refs are only used by Memoize, it seems
>> more sensible to compute them there.  But I'm a little worried that
>> doing this would make get_memoize_path too expensive.
>>
>> Please see v4 patch for this change.
>>
>
> I'd like to add that not checking PHVs for lateral references can lead
> to performance regressions with Memoize node.
>

The v4 patch does not apply any more.  I've rebased it on master.
Nothing else has changed.

Thanks
Richard

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><div class=3D"gmail_quote"><div=
 dir=3D"ltr" class=3D"gmail_attr">On Mon, Dec 25, 2023 at 3:01=E2=80=AFPM R=
ichard Guo &lt;<a href=3D"mailto:guofenglinux@gmail.com">guofenglinux@gmail=
.com</a>&gt; wrote:</div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=
<div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Thu, Jul 13, 2023 at 3:12=E2=80=AFPM Richard Guo &lt;<a href=3D"m=
ailto:guofenglinux@gmail.com" target=3D"_blank">guofenglinux@gmail.com</a>&=
gt; wrote:</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr"><div class=3D"gmail_quote"><div>So I&#39;m wondering if it&#39;d b=
e better that we move all this logic of<br>computing additional lateral ref=
erences within PHVs to get_memoize_path,<br>where we can examine only PHVs =
that are evaluated at innerrel.=C2=A0 And<br>considering that these lateral=
 refs are only used by Memoize, it seems<br>more sensible to compute them t=
here.=C2=A0 But I&#39;m a little worried that<br>doing this would make get_=
memoize_path too expensive.<br><br>Please see v4 patch for this change.</di=
v></div></div></blockquote><div><br></div><div>I&#39;d like to add that not=
 checking PHVs for lateral references can lead<br>to performance regression=
s with Memoize node.=C2=A0</div></div></div></blockquote><div><br></div><di=
v>The v4 patch does not apply any more.=C2=A0 I&#39;ve rebased it on master=
.<br>Nothing else has changed.<br><br>Thanks<br>Richard<br></div></div></di=
v>

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