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From: Jim Jones <[email protected]>
To: Andreas Karlsson <[email protected]>
To: PostgreSQL Hackers <[email protected]>
Subject: Re: Prevent setting NO INHERIT on partitioned not-null constraints
Date: Thu, 21 May 2026 17:01:51 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Hi Andreas

On 20/05/2026 21:25, Andreas Karlsson wrote:
> Me and Joel found a bug when working on another patch. We noticed that
> you cannot create not-null constraints with NO INHEIRT set on
> partitioned tables, but you can actually set it later by using ALTER
> CONSTRAINT. This must be an oversight so I have attached a patch which
> adds a check to prevent this.
> 
> The SQL below should give an error but does not:
> 
> CREATE TABLE t (
>   a int,
>   CONSTRAINT a_is_not_null NOT NULL a
> ) PARTITION BY LIST (a);
> 
> ALTER TABLE t ALTER CONSTRAINT a_is_not_null NO INHERIT;

+1 for the fix.

postgres=# CREATE TABLE t (
  a int,
  CONSTRAINT a_is_not_null NOT NULL a
) PARTITION BY LIST (a);
CREATE TABLE
postgres=# ALTER TABLE t ALTER CONSTRAINT a_is_not_null NO INHERIT;
ERROR:  not-null constraint "a_is_not_null" on partitioned table "t"
cannot be NO INHERIT

The errcode is most likely wrong:

ERRCODE_WRONG_OBJECT_TYPE -> ERRCODE_FEATURE_NOT_SUPPORTED

At least it is inconsistent with an equivalent check in parse_utilcmd.c:

if (cxt->ispartitioned && constraint->is_no_inherit)
  ereport(ERROR,
	  errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
          errmsg("not-null constraints on partitioned tables cannot be
NO INHERIT"));

Thanks!

Best, Jim

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