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Date: Thu, 26 Feb 2026 15:20:08 +0100
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Subject: Re: BUG #19418: SQL/JSON JSON_VALUE() does not conform to ISO/IEC
 9075-2:2023(E) 6.34 <JSON value constructor>
To: lukas.eder@gmail.com, pgsql-bugs@lists.postgresql.org,
 PG Bug reporting form <noreply@postgresql.org>
References: <19418-591ba1f29862ef5b@postgresql.org>
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From: Vik Fearing <vik@postgresfriends.org>
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On 26/02/2026 10:57, PG Bug reporting form wrote:
> The following bug has been logged on the website:
>
> Bug reference:      19418
> Logged by:          Lukas Eder
> Email address:      lukas.eder@gmail.com
> PostgreSQL version: 18.2
> Operating system:   Linux
> Description:
>
> When using the ISO/IEC 9075-2:2023(E) 6.34 <JSON value constructor by query>
> syntax, 6.34 GR 4) b) i) says that empty tables should produce a JSON array
> with no elements (intuitively), not NULL.
>
> Try this:
>
>    select json_array(select 1 where false);
>
> It produces NULL, not []


I can confirm that postgres violates the standard here.

-- 

Vik Fearing