BUG #17147: Why concat_ws and concat is not immutable?

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: rekgrpth(at)gmail(dot)com
Subject: BUG #17147: Why concat_ws and concat is not immutable?
Date: 2021-08-16 12:03:48
Message-ID: 17147-11e30c950a4faae8@postgresql.org
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The following bug has been logged on the website:

Bug reference: 17147
Logged by: RekGRpth
Email address: rekgrpth(at)gmail(dot)com
PostgreSQL version: 13.4
Operating system: docker alpine
Description:

Why concat_ws and concat is not immutable? And why they cannot be used in
generated always as?

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