From: Tom Lane <tgl@sss.pgh.pa.us>
To: "David G. Johnston" <david.g.johnston@gmail.com>
cc: edouard.hibon@free.fr,
        PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>
Subject: Re: BUG #17206: the function array_cat(anyarray,
 anyarray) does not exist
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References: <17206-f0a6b77a0a7b8499@postgresql.org>
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Comments: In-reply-to "David G. Johnston" <david.g.johnston@gmail.com>
	message dated "Thu, 30 Sep 2021 15:49:03 -0700"
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Date: Thu, 30 Sep 2021 19:52:17 -0400
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"David G. Johnston" <david.g.johnston@gmail.com> writes:
> On Thu, Sep 30, 2021 at 2:51 PM PG Bug reporting form <
> noreply@postgresql.org> wrote:
>> I get the ERROR : the function array_cat(anyarray, anyarray) does not
>> exist,

> You may find this commit to be illuminating.  Work was done in this area
> for v14.
> https://github.com/postgres/postgres/commit/97f73a978fc1aca59c6ad765548c=
e0096d95a923

This one might be more so:

https://git.postgresql.org/gitweb/?p=3Dpostgresql.git&a=3Dcommitdiff&h=3D9=
e38c2bb50

Also see the very first item in the v14 compatibility notes:

    User-defined objects that reference certain built-in array functions
    along with their argument types must be recreated (Tom Lane)

    Specifically, array_append(), array_prepend(), array_cat(),
    array_position(), array_positions(), array_remove(), array_replace(),
    and width_bucket() used to take anyarray arguments but now take
    anycompatiblearray. Therefore, user-defined objects like aggregates
    and operators that reference those array function signatures must be
    dropped before upgrading, and recreated once the upgrade completes.

			regards, tom lane