Right. Thanks for posting the solution!
On Thu, Jun 11, 2026 at 4:24 PM Markos Volikas <[email protected]> wrote:
> Hi,
>
> For anyone interested, we've been using the following workaround:
>
> Instead of prepending the fq with the extra {!tag=foo} localParam, one
> can directly add the tag=foo key-value pair inside the {!collapse}.
>
> That is:
>
> "q":"*:*",
> "q.op":"AND",
> "fq":"{!collapse field=id*tag=foo*}",
>
> This works because tag registration in the constructor of QParser reads
> this value explicitly
> <
> https://github.com/apache/solr/blob/releases/solr/9.10.0/solr/core/src/java/org/apache/solr/search/QParser.java#L84
> >.
>
> Best,
>
> Markos
>
> On 6/9/26 13:16, Mikhail Khludnev wrote:
> > Hi,
> > Never heard of it.
> >
> > On Mon, Jun 8, 2026 at 6:05 PM Markos Volikas<[email protected]>
> wrote:
> >
> >> Thanks for the suggestion, Mikhail!
> >>
> >> So, from what I understand, this is expected behavior. Are there any
> >> plans to make it possible for such a query combination to work in the
> >> future?
> >>
> >> Markos
> >>
> >> On 5/13/26 12:00, Mikhail Khludnev wrote:
> >>> Perhaps, SolrIndexSearcher.getProcessedFilter() may do a better job
> >>> detecting and handling postFilter-only filter queries.
> >>> Markos, as a workaround you may use a few queries, like with&without
> >>> filter, etc.
> >>>
> >>> On Wed, May 13, 2026 at 11:17 AM Markos Volikas<[email protected]>
> >> wrote:
> >>>> Hi everyone,
> >>>>
> >>>> I'm getting the following error (full trace attached) when combining
> the
> >>>> collapse query parser with the AND operator + tagging:
> >>>>
> >>>> Query CollapsingPostFilter(field=id, nullPolicy=ignore,
> >>>> GroupHeadSelector(selectorText=score, type=SCORE), size=100000) does
> not
> >>>> implement createWeight
> >>>>
> >>>> The query parameters I've been using are:
> >>>>
> >>>> "q":"*:*",
> >>>> "q.op":"AND",
> >>>> "fq":"{!tag=foo}{!collapse field=id}",
> >>>>
> >>>> Changing the operator to OR *or* removing the tag resolves the issue.
> >>>>
> >>>> You can reproduce by creating a collection with the default schema and
> >>>> indexing some sample data for testing the collapsing. I've tested with
> >> Solr
> >>>> 10 and Solr 7, and both have the same issue.
> >>>>
> >>>> Do you know if this is expected behavior? And if so, why?
> >>>>
> >>>> Thanks,
> >>>>
> >>>> Markos
> >>>>
> >
--
Sincerely yours
Mikhail Khludnev
