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From: [email protected]
To: [email protected]
Subject: Collation changes
Date: Sat, 30 May 2026 21:41:56 +0200
Message-ID: <[email protected]> (raw)

Hello,

I thought I had understood the problems with libc collation changes, but today a Fedora update showed me, that I probably did not :)

After refreshing the encodings for the databases (and reindexing) I thought I'd have a look at the versions in pg_collation using the following query:

     select collname,
            collversion,
            pg_encoding_to_char(collencoding) as encoding,
            pg_collation_actual_version(oid)
     from pg_collation
     where collprovider = 'c'
       and collversion <> pg_collation_actual_version(oid)

The query returned several hundred collations, all with a non UTF-8 encoding (mostly single byte encodings).

Running "alter collation ... refresh version" on them resulted in

    NOTICE:  version has not changed

Which confuses me, as the above query showed collversion = 2.41 and pg_collation_actual_version() returned 2.43

Can someone clear up my confusion?

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