MIME-Version: 1.0
From: SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com>
Date: Fri, 10 Apr 2026 13:18:36 -0700
Message-ID: 
 <CAHg+QDcdkGQ4Q683Uq7ZJ0P6NcbB=F3Sh8thMSiFY9wwnSEoQQ@mail.gmail.com>
Subject: Infinite Autovacuum loop caused by failing virtual generated column
 expression
To: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 nagata@sraoss.co.jp
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Hi Hackers,

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 autovacuum retrying
indefinitely. This floods the server logs and also wastes resources. Vacuum
analyze on that column (without extended stats) succeeds.

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 avoid
autovacuum infinite retry. Attached a draft patch for the option (2).
Thoughts?


Repro:

CREATE TABLE t (
        id int PRIMARY KEY,
        a int,
        gen int GENERATED ALWAYS AS (100 / a) VIRTUAL
    );
    INSERT INTO t VALUES (1, 10), (2, 5), (3, 0);

    -- This succeeds (per-column stats don't evaluate the expression for
every row)
    ANALYZE t;

    -- Add extended statistics referencing the virtual gen col
    CREATE STATISTICS t_stat ON a, gen FROM t;

    -- This fails
    ANALYZE t;
    -- ERROR:  division by zero

-- this succeeds
ANALYZE t(gen)

[1]:
https://www.postgresql.org/message-id/flat/20250422181006.dd6f9d1d81299f5b2ad55e1a%40sraoss.co.jp

Thanks,
Satya

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<div dir=3D"ltr">Hi Hackers,<div><br></div><div>PG19 added support for stat=
s on virtual generated columns [1]. Creating extended statistics on a virtu=
al generated column whose expression can raise an error leads to ANALYZE fa=
iling repeatedly, and autovacuum retrying indefinitely. This floods the ser=
ver logs and also wastes resources. Vacuum analyze on that column=C2=A0(wit=
hout extended stats) succeeds.</div><div><br></div><div>In order to avoid r=
etry storms, I think we have two options. (1) skipping=C2=A0the offending r=
ow from the sample, (2) skipping the extended stats computation for that ta=
ble with a warning message. At least this avoid autovacuum infinite retry. =
Attached a draft patch for the option (2). Thoughts?</div><div><br></div><d=
iv><br></div><div>Repro:</div><div><br></div><div>CREATE TABLE t (<br>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 id int PRIMARY KEY,<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 a int,<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 gen int GENERATED ALWAYS AS (100 / a=
) VIRTUAL<br>=C2=A0 =C2=A0 );<br>=C2=A0 =C2=A0 INSERT INTO t VALUES (1, 10)=
, (2, 5), (3, 0);<br><br>=C2=A0 =C2=A0 -- This succeeds (per-column stats d=
on&#39;t evaluate the expression for every row)<br>=C2=A0 =C2=A0 ANALYZE t;=
<br><br>=C2=A0 =C2=A0 -- Add extended statistics referencing the virtual ge=
n col<br>=C2=A0 =C2=A0 CREATE STATISTICS t_stat ON a, gen FROM t;<br><br>=
=C2=A0 =C2=A0 -- This fails<br>=C2=A0 =C2=A0 ANALYZE t;<br>=C2=A0 =C2=A0 --=
 ERROR: =C2=A0division by zero<br></div><div><br></div><div>-- this succeed=
s</div><div>ANALYZE t(gen)</div><div><br></div><div>[1]:=C2=A0<a href=3D"ht=
tps://www.postgresql.org/message-id/flat/20250422181006.dd6f9d1d81299f5b2ad=
55e1a%40sraoss.co.jp">https://www.postgresql.org/message-id/flat/2025042218=
1006.dd6f9d1d81299f5b2ad55e1a%40sraoss.co.jp</a></div><div>=C2=A0</div><div=
>Thanks,</div><div>Satya</div><div><br></div><div><br></div><div><br></div>=
</div>

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