ERROR: could not determine which collation to use for string comparison

From: Rômulo Coutinho <romulo(at)supersim(dot)com(dot)br>
To: pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: ERROR: could not determine which collation to use for string comparison
Date: 2023-06-06 14:42:36
Message-ID: CAMdDbQze7QKgxWKv8+Tice4GopYUh-KAwGgFbdJiUrmm097JWQ@mail.gmail.com
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Hi,

We recently upgraded to Postgres 15.3. When running ANALYZE, we get the
following message:
ERROR: could not determine which collation to use for string comparison
HINT: Use the COLLATE clause to set the collation explicitly.

We have never seen this before. Could this be a bug?

Regards,

Rômulo Coutinho.

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