From: Tom Lane <tgl@sss.pgh.pa.us>
To: shohorab hossain <shohorab23@gmail.com>
cc: pgsql-bugs@lists.postgresql.org
Subject: Re: ERROR: commutator operator - is already the commutator of
 operator +
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Comments: In-reply-to shohorab hossain <shohorab23@gmail.com>
	message dated "Sun, 17 Nov 2024 17:49:28 +0600"
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Date: Sun, 17 Nov 2024 11:05:35 -0500
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shohorab hossain <shohorab23@gmail.com> writes:
>  Whenever I try to restore a dump database backup to PostgreSQL version
> 17.1, I receive the following error log. The dump is from PostgreSQL
> version 15.8.

> What is this error and how can I fix it?.
> pg_restore: error: could not execute query: ERROR: commutator operator - is
> already the commutator of operator +

v17 is complaining about a logically-inconsistent situation that
earlier versions did not notice.  You have interval - numeric
claiming to be the commutator of numeric - interval, which seems
fine --- but according to this error message, numeric - interval
is claiming to be the commutator of interval + numeric.  If these
operators have anything like the semantics their names suggest,
that commutator linkage is a bug in the operator's definition.
You need to get rid of it, or better adjust it to point to the
right operator, ie interval - numeric.

We don't have any syntax for adjusting the commutator link
once set, but maybe you could manually edit the dump file.

			regards, tom lane