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From: jian he <[email protected]>
To: Vik Fearing <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: PG Bug reporting form <[email protected]>
Subject: Re: BUG #19418: SQL/JSON JSON_VALUE() does not conform to ISO/IEC 9075-2:2023(E) 6.34 <JSON value constructor>
Date: Tue, 3 Mar 2026 10:41:47 +0800
Message-ID: <CACJufxFRtto3WCDLusTsWQZqSdBqc9_LEuA_3S4sjfU_-U7ROw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

On Thu, Feb 26, 2026 at 10:20 PM Vik Fearing <[email protected]> wrote:
>
> > Try this:
> >
> >    select json_array(select 1 where false);
> >
> > It produces NULL, not []
>
>
> I can confirm that postgres violates the standard here.
>
> --

Since the subject title mentioned JSON_VALUE.

SELECT JSON_VALUE(((select NULL where false)), '$');
SELECT JSON_QUERY(((select NULL where false)), '$');
SELECT JSON_EXISTS(((select NULL where false)), '$');

Should the above produce []?



--
jian
https://www.enterprisedb.com/

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