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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andreas Karlsson <andreas@proxel.se>
Cc: Andrei Klychkov <andrew.a.klychkov@gmail.com>
Cc: Jim Jones <jim.jones@uni-muenster.de>
Cc: Fujii Masao <masao.fujii@gmail.com>
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: [PATCH] Fix ALTER SYSTEM empty string bug for GUC_LIST_QUOTE parameters
Date: Tue, 04 Nov 2025 12:24:41 -0500
Message-ID: <642906.1762277081@sss.pgh.pa.us> (raw)
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References: <CA+mfrmwsBmYsJayWjc8bJmicxc3phZcHHY=yW5aYe=P-1d_4bg@mail.gmail.com>
	<38091678-2820-4bc8-8df7-b417562f7860@uni-muenster.de>
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	<1046095.1757007639@sss.pgh.pa.us>
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	<117311.1762027906@sss.pgh.pa.us>
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	<7b2cf326-72bc-4681-89a1-c8347f9c32f8@proxel.se>

Andreas Karlsson <andreas@proxel.se> writes:
> Honestly none of the alternatives is very appealing and v6 is probably 
> the least bad.

Yeah, that's about where I'm at with this.

> When I ran into this issue I thought about adding and EMPTY keyword (we 
> do not want more keywords) or adding support for specifying array 
> literals like this [] or [a, b], but that would be confusing since 
> postgresql.conf does not allow any such syntax.

I would have preferred a different keyword.  But AFAICS it'd have to
be a fully-reserved word, and creating a new one of those has to
clear a pretty high bar.  NULL is not so far off...

			regards, tom lane





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  Cc: tgl@sss.pgh.pa.us, andreas@proxel.se, andrew.a.klychkov@gmail.com, jim.jones@uni-muenster.de, masao.fujii@gmail.com, pgsql-hackers@lists.postgresql.org
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