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In-Reply-To: 
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From: Aleksander Alekseev <aleksander@tigerdata.com>
Date: Thu, 19 Mar 2026 15:18:48 +0300
Message-ID: 
 <CAJ7c6TM=xPAwj4AvN6O4qXa7vc5cLGdDZb21ohqKp-cy2TJyWA@mail.gmail.com>
Subject: Re: Add uuid_to_base32hex() and base32hex_to_uuid() built-in
 functions
To: pgsql-hackers <pgsql-hackers@postgresql.org>
Cc: Chengxi Sun <chengxisun92@gmail.com>,
 Masahiko Sawada <sawada.mshk@gmail.com>,
	Andrey Borodin <x4mmm@yandex-team.ru>,
 =?UTF-8?Q?Dagfinn_Ilmari_Manns=C3=A5ker?= <ilmari@ilmari.org>
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Precedence: bulk

Hi,

> I might be missing some context here, so I wanted to ask: is this behavior intentional,
> or would it make sense to enforce stricter validation for Base32hex input?

That's intentional - see the discussion above:

"""
[...]
This code checks if the remaining bits of the input data are all zero.
IIUC we don't have a similar check for base64 and base64url. For
instance, the following input data is accepted:

=# select decode('AB', 'base64');
 decode
--------
 \x00
(1 row)
"""

Also see the documentation in respect of padding.

-- 
Best regards,
Aleksander Alekseev