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References: <CAEoWx2kggo1N2kDH6OSfXHL_5gKg3DqQ0PdNuL4LH4XSTKJ3-g@mail.gmail.com>
In-Reply-To: <CAEoWx2kggo1N2kDH6OSfXHL_5gKg3DqQ0PdNuL4LH4XSTKJ3-g@mail.gmail.com>
From: Chao Li <li.evan.chao@gmail.com>
Date: Thu, 22 Jan 2026 17:01:38 +0800
Message-ID: <CAEoWx2k5800OjHO5KhTDv4JFYpDmyfh3MTtuB=7PP-0hLmG8yQ@mail.gmail.com>
Subject: Re: tablecmds: reject CLUSTER ON for partitioned tables earlier
To: Postgres hackers <pgsql-hackers@lists.postgresql.org>
Content-Type: multipart/mixed; boundary="000000000000a336ee0648f64a8f"
Archived-At: <https://www.postgresql.org/message-id/CAEoWx2k5800OjHO5KhTDv4JFYpDmyfh3MTtuB%3D7PP-0hLmG8yQ%40mail.gmail.com>
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On Jan 21, 2026, at 11:55, Chao Li <li.evan.chao@gmail.com> wrote:

Hi Hacker,

I noticed this while working other patches related to =E2=80=9CALTER TABLE=
=E2=80=9D.

=E2=80=9CALTER TABLE =E2=80=A6 CLUSTER ON=E2=80=9D and "SET WITHOUT CLUSTER=
" are not supported for
partitioned tables, but currently ATPrepCmd() allows them through and they
only fail later at execution time.

This patch rejects these commands earlier by using the existing
ATSimplePermissions() infrastructure in ATPrepCmd(), matching the handling
of other unsupported ALTER TABLE actions on partitioned tables (such as SET
LOGGED / SET UNLOGGED). This makes the behavior more consistent and
simplifies the code path.

As a result, the error reported for partitioned tables changes:

Before the patch:
```
evantest=3D# ALTER TABLE p_test CLUSTER ON idx_p_test_id;
ERROR:  cannot mark index clustered in partitioned table
```

With the patch:
```
evantest=3D# ALTER TABLE p_test CLUSTER ON idx_p_test_id;
ERROR:  ALTER action CLUSTER ON cannot be performed on relation "p_test"
DETAIL:  This operation is not supported for partitioned tables.
```

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/


<v1-0001-tablecmds-reject-CLUSTER-ON-for-partitioned-table.patch>


Applying the same change to INHERIT/NO INHeRIT in v2-0002. Other than that,
fixing 2 more things for INHERIT/NO INHERIT:

* The header comment of ATPrepAddInherit() was a copy-paste mistake, it
described something totally unrelated.
* NO INHERIT didn=E2=80=99t call ATPrepAddInherit() to check early, so it h=
ad to go
deeper and run unnecessary checks.

Basically, 0001 and 0002 do the same thing on two sub-commands. If
accepted, they can be squashed.

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/

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<div dir=3D"ltr"><div dir=3D"auto" style=3D"line-break:after-white-space"><=
br id=3D"m_-1004757139116377363lineBreakAtBeginningOfMessage"><br><blockquo=
te type=3D"cite">On Jan 21, 2026, at 11:55, Chao Li &lt;<a href=3D"mailto:l=
i.evan.chao@gmail.com" target=3D"_blank">li.evan.chao@gmail.com</a>&gt; wro=
te:<br><br>Hi Hacker,<br><br>I noticed this while working other patches rel=
ated to =E2=80=9CALTER TABLE=E2=80=9D.<br><br>=E2=80=9CALTER TABLE =E2=80=
=A6 CLUSTER ON=E2=80=9D and &quot;SET WITHOUT CLUSTER&quot; are not support=
ed for partitioned tables, but currently ATPrepCmd() allows them through an=
d they only fail later at execution time.<br><br>This patch rejects these c=
ommands earlier by using the existing ATSimplePermissions() infrastructure =
in ATPrepCmd(), matching the handling of other unsupported ALTER TABLE acti=
ons on partitioned tables (such as SET LOGGED / SET UNLOGGED). This makes t=
he behavior more consistent and simplifies the code path.<br><br>As a resul=
t, the error reported for partitioned tables changes:<br><br>Before the pat=
ch:<br>```<br>evantest=3D#=C2=A0ALTER=C2=A0TABLE=C2=A0p_test CLUSTER=C2=A0O=
N=C2=A0idx_p_test_id;<br>ERROR:=C2=A0=C2=A0cannot=C2=A0mark=C2=A0index=C2=
=A0clustered=C2=A0in=C2=A0partitioned=C2=A0table<br>```<br><br>With the pat=
ch:<br>```<br>evantest=3D# ALTER TABLE p_test CLUSTER ON idx_p_test_id;<br>=
ERROR: =C2=A0ALTER action CLUSTER ON cannot be performed on relation &quot;=
p_test&quot;<br>DETAIL: =C2=A0This operation is not supported for partition=
ed tables.<br>```<br><br>Best regards,<br>
--<br>Chao Li (Evan)<br>HighGo Software Co., Ltd.<br><a href=3D"https://www=
.highgo.com/" target=3D"_blank">https://www.highgo.com/</a><br><br><br><br>


<br>
<span id=3D"m_-1004757139116377363cid:f_mknhmllw0">&lt;v1-0001-tablecmds-re=
ject-CLUSTER-ON-for-partitioned-table.patch&gt;</span></blockquote><div><br=
></div><div><br></div><div>Applying the same change to INHERIT/NO INHeRIT i=
n v2-0002. Other than that, fixing 2 more things for INHERIT/NO INHERIT:</d=
iv><div><br></div><div>* The header comment of=C2=A0ATPrepAddInherit() was =
a copy-paste mistake, it described something totally unrelated.</div><div>*=
=C2=A0NO INHERIT didn=E2=80=99t call=C2=A0ATPrepAddInherit() to check early=
, so it had to go deeper and run unnecessary checks.</div><div><br></div><d=
iv>Basically, 0001 and 0002 do the same thing on two sub-commands. If accep=
ted, they can be squashed.</div><div><br></div>Best regards,<br><div id=3D"=
m_-1004757139116377363AppleMailSignature">
--<br>Chao Li (Evan)<br>HighGo Software Co., Ltd.<br><a href=3D"https://www=
.highgo.com/" target=3D"_blank">https://www.highgo.com/</a><br><br></div></=
div></div>

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