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In-Reply-To: <20260428181420.2288f18ed3aa42cef2a7c7ca@sraoss.co.jp>
From: SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com>
Date: Sun, 3 May 2026 11:04:59 -0700
Message-ID: 
 <CAHg+QDdFeuYKuX3=_-5-VvyaCkS9zgzOEjeC77dw7Wtrx_TqAA@mail.gmail.com>
Subject: Re: Infinite Autovacuum loop caused by failing virtual generated
 column expression
To: Yugo Nagata <nagata@sraoss.co.jp>
Cc: Dean Rasheed <dean.a.rasheed@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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Hi,

On Tue, Apr 28, 2026 at 2:14=E2=80=AFAM Yugo Nagata <nagata@sraoss.co.jp> w=
rote:

> On Tue, 14 Apr 2026 00:16:42 -0700
> SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com> wrote:
>
> > Hi
> >
> > On Mon, Apr 13, 2026 at 11:24=E2=80=AFPM Yugo Nagata <nagata@sraoss.co.=
jp>
> wrote:
> >
> > > On Sat, 11 Apr 2026 17:33:13 +0100
> > > Dean Rasheed <dean.a.rasheed@gmail.com> wrote:
> > >
> > > > On Fri, 10 Apr 2026 at 21:19, SATYANARAYANA NARLAPURAM
> > > > <satyanarlapuram@gmail.com> wrote:
> > > > >
> > > > > PG19 added support for stats on virtual generated columns [1].
> > > Creating extended statistics on a virtual generated column whose
> expression
> > > can raise an error leads to ANALYZE failing repeatedly, and autovacuu=
m
> > > retrying indefinitely. This floods the server logs and also wastes
> > > resources. Vacuum analyze on that column (without extended stats)
> succeeds.
> > > > >
> > > >
> > > > True, though this is nothing new. The same thing can happen with
> > > > expression statistics on an expression that raises an error, which
> has
> > > > been possible since PG14.
> > >
> > > Yes, this issue is not new, and I=E2=80=99m not aware of a way to pre=
vent it a
> > > priori.
> > >
> > > >
> > > > > In order to avoid retry storms, I think we have two options. (1)
> > > skipping the offending row from the sample, (2) skipping the extended
> stats
> > > computation for that table with a warning message. At least this avoi=
d
> > > autovacuum infinite retry. Attached a draft patch for the option (2).
> > > Thoughts?
> > > > >
> > > >
> > > > I'm not sure. The default retry interval is 1 minute, so it won't
> > > > exactly be a flood of messages. Also, if the error only occurs for =
a
> > > > small subset of rows, it's possible that retrying might succeed.
> > >
> > > I think it would be good to skip ANALYZE for the extended statistics
> that
> > > cause
> > > errors and just emit a warning, rather than aborting ANALYZE for the
> > > entire table.
> > > It seems reasonable to treat this as the user=E2=80=99s responsibilit=
y to
> notice
> > > the warning
> > > and address the underlying issue.
> > >
> >
> > Yugo, thanks for the comments. Could you please review the v1 patch whe=
n
> you
> > get a chance. It is in the direction you suggested.
>
> I've looked into the patch and have some comments.
>
> The child ResourceOwner is created and released in
> BuildRelationExtStatistics(),
> but I don't think it is necessary if we add other PG_TRY block in
> make_build_data()
> and compute_expr_stats(). For example in make_build_data():
>
> +                       PG_TRY();
> +                       {
> +                               datum =3D ExecEvalExpr(exprstate,
> +
> GetPerTupleExprContext(estate),
> +
> &isnull);
> +                               }
> +                       PG_CATCH();
> +                       {
> +                               ExecDropSingleTupleTableSlot(slot);
> +                               FreeExecutorState(estate);
> +                               PG_RE_THROW();
> +                       }
> +                       PG_END_TRY();
>

Thanks, for reviewing the patch. Agreed, please find the updated patch.


> Also, we could add tests for extended statistics that do not involve
> virtual generated
> columns, since those are not the cause root of the issue. In addition, it
> might be useful
> to verify that non-skipped extended statistics are still computed
> successfully.
> For example:
>
> +CREATE TABLE expr_err (a int);
> +INSERT INTO expr_err VALUES (1), (2), (3);
> +CREATE STATISTICS expr_err_s1 ON ((a/0)) FROM expr_err;
> +CREATE STATISTICS expr_err_s2 ON (a/0),(a+1) FROM expr_err;
> +CREATE STATISTICS expr_err_s3 ON ((a+1)) FROM expr_err;
> +ANALYZE expr_err;  -- should warn, not fail
> +SELECT statistics_name from pg_stats_ext x
> +    WHERE tablename =3D 'expr_err' ORDER BY ROW(x.*);
>

Added these tests as well in the v2 patch.

 Thanks,
Satya

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<div dir=3D"ltr"><div dir=3D"ltr">Hi,</div><br><div class=3D"gmail_quote gm=
ail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Apr 28, =
2026 at 2:14=E2=80=AFAM Yugo Nagata &lt;<a href=3D"mailto:nagata@sraoss.co.=
jp">nagata@sraoss.co.jp</a>&gt; wrote:<br></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">On Tue, 14 Apr 2026 00:16:42 -0700<br>
SATYANARAYANA NARLAPURAM &lt;<a href=3D"mailto:satyanarlapuram@gmail.com" t=
arget=3D"_blank">satyanarlapuram@gmail.com</a>&gt; wrote:<br>
<br>
&gt; Hi<br>
&gt; <br>
&gt; On Mon, Apr 13, 2026 at 11:24=E2=80=AFPM Yugo Nagata &lt;<a href=3D"ma=
ilto:nagata@sraoss.co.jp" target=3D"_blank">nagata@sraoss.co.jp</a>&gt; wro=
te:<br>
&gt; <br>
&gt; &gt; On Sat, 11 Apr 2026 17:33:13 +0100<br>
&gt; &gt; Dean Rasheed &lt;<a href=3D"mailto:dean.a.rasheed@gmail.com" targ=
et=3D"_blank">dean.a.rasheed@gmail.com</a>&gt; wrote:<br>
&gt; &gt;<br>
&gt; &gt; &gt; On Fri, 10 Apr 2026 at 21:19, SATYANARAYANA NARLAPURAM<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:satyanarlapuram@gmail.com" target=3D"_=
blank">satyanarlapuram@gmail.com</a>&gt; wrote:<br>
&gt; &gt; &gt; &gt;<br>
&gt; &gt; &gt; &gt; PG19 added support for stats on virtual generated colum=
ns [1].<br>
&gt; &gt; Creating extended statistics on a virtual generated column whose =
expression<br>
&gt; &gt; can raise an error leads to ANALYZE failing repeatedly, and autov=
acuum<br>
&gt; &gt; retrying indefinitely. This floods the server logs and also waste=
s<br>
&gt; &gt; resources. Vacuum analyze on that column (without extended stats)=
 succeeds.<br>
&gt; &gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; True, though this is nothing new. The same thing can happen =
with<br>
&gt; &gt; &gt; expression statistics on an expression that raises an error,=
 which has<br>
&gt; &gt; &gt; been possible since PG14.<br>
&gt; &gt;<br>
&gt; &gt; Yes, this issue is not new, and I=E2=80=99m not aware of a way to=
 prevent it a<br>
&gt; &gt; priori.<br>
&gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; &gt; In order to avoid retry storms, I think we have two opt=
ions. (1)<br>
&gt; &gt; skipping the offending row from the sample, (2) skipping the exte=
nded stats<br>
&gt; &gt; computation for that table with a warning message. At least this =
avoid<br>
&gt; &gt; autovacuum infinite retry. Attached a draft patch for the option =
(2).<br>
&gt; &gt; Thoughts?<br>
&gt; &gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; I&#39;m not sure. The default retry interval is 1 minute, so=
 it won&#39;t<br>
&gt; &gt; &gt; exactly be a flood of messages. Also, if the error only occu=
rs for a<br>
&gt; &gt; &gt; small subset of rows, it&#39;s possible that retrying might =
succeed.<br>
&gt; &gt;<br>
&gt; &gt; I think it would be good to skip ANALYZE for the extended statist=
ics that<br>
&gt; &gt; cause<br>
&gt; &gt; errors and just emit a warning, rather than aborting ANALYZE for =
the<br>
&gt; &gt; entire table.<br>
&gt; &gt; It seems reasonable to treat this as the user=E2=80=99s responsib=
ility to notice<br>
&gt; &gt; the warning<br>
&gt; &gt; and address the underlying issue.<br>
&gt; &gt;<br>
&gt; <br>
&gt; Yugo, thanks for the comments. Could you please review the v1 patch wh=
en you<br>
&gt; get a chance. It is in the direction you suggested.<br>
<br>
I&#39;ve looked into the patch and have some comments.<br>
<br>
The child ResourceOwner is created and released in BuildRelationExtStatisti=
cs(),<br>
but I don&#39;t think it is necessary if we add other PG_TRY block in make_=
build_data()<br>
and compute_expr_stats(). For example in make_build_data():<br>
<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0PG_TRY();<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0{<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0datum =3D ExecEvalExpr(exprstate,<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 GetPerTupleExprContext(estate),<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &amp;isnull);<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0}<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0PG_CATCH();<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0{<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ExecDropSingleTupleTableSlot(slot);<b=
r>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0FreeExecutorState(estate);<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0PG_RE_THROW();<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0}<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0PG_END_TRY();<br></blockquote><div><br></div><div>Thanks, for rev=
iewing the patch. Agreed, please find the updated patch.</div><div>=C2=A0</=
div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bor=
der-left:1px solid rgb(204,204,204);padding-left:1ex">
Also, we could add tests for extended statistics that do not involve virtua=
l generated<br>
columns, since those are not the cause root of the issue. In addition, it m=
ight be useful<br>
to verify that non-skipped extended statistics are still computed successfu=
lly.<br>
For example:<br>
<br>
+CREATE TABLE expr_err (a int);<br>
+INSERT INTO expr_err VALUES (1), (2), (3);<br>
+CREATE STATISTICS expr_err_s1 ON ((a/0)) FROM expr_err;<br>
+CREATE STATISTICS expr_err_s2 ON (a/0),(a+1) FROM expr_err;<br>
+CREATE STATISTICS expr_err_s3 ON ((a+1)) FROM expr_err;<br>
+ANALYZE expr_err;=C2=A0 -- should warn, not fail<br>
+SELECT statistics_name from pg_stats_ext x<br>
+=C2=A0 =C2=A0 WHERE tablename =3D &#39;expr_err&#39; ORDER BY ROW(x.*);<br=
></blockquote><div>=C2=A0</div><div>Added these tests as well in the v2 pat=
ch.</div><div><br></div><div>=C2=A0Thanks,</div><div>Satya</div></div></div=
>

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