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From: Tom Lane <[email protected]>
To: jian he <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: ERROR: failed to find conversion function from unknown to text
Date: Wed, 28 Jan 2026 20:24:19 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <CACJufxHu0sXO8791FDcNXp2bFnE89jyuGkJbLCQkhgWq6XuNLg@mail.gmail.com>
References: <CACJufxHu0sXO8791FDcNXp2bFnE89jyuGkJbLCQkhgWq6XuNLg@mail.gmail.com>

jian he <[email protected]> writes:
> select cast(NULL::text as unknown);
> ERROR:  failed to find conversion function from unknown to text

Is there a good reason why that shouldn't be an error?
I certainly don't like the cast pathway you suggest adding
to make it not be one --- that seems likely to cause lots of
not-very-desirable behaviors.

			regards, tom lane

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