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https://issues.apache.org/jira/browse/LUCENE-9017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17093329#comment-17093329
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Alan Woodward commented on LUCENE-9017:
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SortedSetFieldSource by default chooses the minimum value for each document. I
don't think there's a way of grouping by all possible values at the moment, the
various collectors all assume one grouping value per document.
> GroupingSearch does not return all the groups when using
> SortedSetDocValuesField
> --------------------------------------------------------------------------------
>
> Key: LUCENE-9017
> URL: https://issues.apache.org/jira/browse/LUCENE-9017
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 8.2
> Reporter: Juraj Kucera
> Priority: Major
>
> I managed to retrieve the groups using the *SortedSetDocValuesField* in
> *GroupingSearch* by initializing the groupsearch with *SortedSetFieldSource*
> The problem is when a document has multiple values in the field
> "SortedSetDocValuesField" than not the grouping query does not return all
> the groups.
> Let me demonstrate it in my example
> // indexing, the first object has the category "one" and the second object
> has category "two" and "three"
> Document doc = new Document();
> doc.add(new FacetField("Author", "Bob"));
> doc.add(new SortedSetDocValuesField("category", new BytesRef("one")));
> indexWriter.addDocument(config.build(taxoWriter, doc));
> doc = new Document();
> doc.add(new FacetField("Author", "Lisa"));
> doc.add(new SortedSetDocValuesField("category", new BytesRef("two")));
> doc.add(new SortedSetDocValuesField("category", new BytesRef("three")));
> indexWriter.addDocument(config.build(taxoWriter, doc));
> // initializing the grouping search
> ValueSource vs = new SortedSetFieldSource(groupField);
> groupingSearch = new GroupingSearch(vs, new HashMap<>());
> // performing the group search
> TopGroups groups = groupingSearch.search(searcher, new MatchAllDocsQuery(),
> 0, 100);
> It returns 2 groups only and I would expect 3 groups ("one", "two" and
> "three")
> *Is it a bug or am I using the API in a wrong way?*
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