“Grouping behaviour has changed in Lucene in terms of how the order of
groups are returned. We either need to work around that to provide backward
compatibility or support the new behaviour. Christine has done some
investigation around it and I have been looking at it, on and off, for a
few months now. I'll update the PR to reflect this soon. There are some
other issues too, but this grouping thing is the major one sticking out.“

I'm confused by this. Do you know what issue it happened in? I don't see
anything mentioned in the migration guide or changes from Lucene that
mentions this. I also did a quick Lucene 10.2.2 upgrade from scratch on
Wednesday, and I didn't have to touch anything in grouping to have all
tests pass.

That's not to say you are wrong, but it does make me interested to know
what Lucene issue you are referring to that made this change.

- MRM


On Thu, Aug 7, 2025 at 11:11 AM Ishan Chattopadhyaya <
ichattopadhy...@gmail.com> wrote:

> I've merged SOLR-17631. Please review the changes on the PR #3053 and the
> now merged commits in the main branch.
>
> On Thu, 24 Jul 2025 at 14:24, Ishan Chattopadhyaya <
> ichattopadhy...@gmail.com> wrote:
>
> > Grouping behaviour has changed in Lucene in terms of how the order of
> > groups are returned. We either need to work around that to provide
> backward
> > compatibility or support the new behaviour. Christine has done some
> > investigation around it and I have been looking at it, on and off, for a
> > few months now. I'll update the PR to reflect this soon. There are some
> > other issues too, but this grouping thing is the major one sticking out.
> >
> > On Wed, 23 Jul 2025 at 22:04, David Smiley <dsmi...@apache.org> wrote:
> >
> >> Commenting on the PR would be the place to offer to help, as the
> pertinent
> >> people involved would see it.
> >>
> >> On Wed, Jul 23, 2025 at 11:43 AM Kevin Liang (BLOOMBERG/ 919 3RD A) <
> >> klian...@bloomberg.net> wrote:
> >>
> >> > I see there's an open PR for going to Lucene 10.2 on solr main (
> >> > https://github.com/apache/solr/pull/3053). I'm curious what the
> current
> >> > status is (as in how much work remains on this)? And how best can I or
> >> > others help on this work?
> >> >
> >> > -Kevin Liang
> >>
> >
>

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