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From: Richard Guo <guofenglinux@gmail.com>
Date: Fri, 30 Dec 2022 11:00:25 +0800
Message-ID: 
 <CAMbWs48TGnh8s=9-hJge9Et4Crf9q+_oU4FVekLoX4ommi4CVg@mail.gmail.com>
Subject: Re: Check lateral references within PHVs for memoize cache keys
To: PostgreSQL-development <pgsql-hackers@postgresql.org>
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On Fri, Dec 9, 2022 at 5:16 PM Richard Guo <guofenglinux@gmail.com> wrote:

> Actually we do have checked PHVs for lateral references, earlier in
> create_lateral_join_info.  But that time we only marked lateral_relids
> and direct_lateral_relids, without remembering the lateral expressions.
> So I'm wondering whether we can fix that by fetching Vars (or PHVs) of
> lateral references within PlaceHolderVars and remembering them in the
> baserel's lateral_vars.
>
> Attach a draft patch to show my thoughts.
>

Update the patch to fix test failures.

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 Fri, Dec 9, 2022 at 5:16 PM Richard Gu=
o &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 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=
=3D"ltr">Actually we do have checked PHVs for lateral references, earlier i=
n<br>create_lateral_join_info.=C2=A0 But that time we only marked lateral_r=
elids<br>and direct_lateral_relids, without remembering the lateral express=
ions.<br>So I&#39;m wondering whether we can fix that by fetching Vars (or =
PHVs) of<br>lateral references within PlaceHolderVars and remembering them =
in the<br>baserel&#39;s lateral_vars.<br><br>Attach a draft patch to show m=
y thoughts.</div></blockquote><div>=C2=A0</div><div>Update the patch to fix=
 test failures.<br><br>Thanks<br>Richard<br></div></div></div>

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