Re: First draft of PG 19 release notes

On Fri, May 1, 2026 at 10:16:24AM +0900, Richard Guo wrote:
> On Wed, Apr 15, 2026 at 10:19 AM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > I have completed the first draft of the PG 19 release notes:
> >
> > https://www.postgresql.org/docs/devel/release-19.html
>
> I just committed 8d829f5a0 to fix JSON_ARRAY(subquery) to return an
> empty JSON array instead of NULL over an empty result set, per the
> SQL/JSON standard. Since this is a user-visible behavior change, we
> need to add an item to the v19 migration section to call it out.
>
> Suggested entry:
>
> - Make JSON_ARRAY(query_expression) return an empty JSON array when
> the subquery returns no rows (Richard Guo)
>
> Previously, an empty result set produced NULL. This corrects the
> behavior to match the SQL/JSON standard. Application code that
> relied on the previous NULL behavior may need to be updated.

I will add this as soon as I update with the new commits. Thanks.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

Do not let urgent matters crowd out time for investment in the future.