[jira] [Created] (LUCENE-9017) GroupingSearch does not return all the groups when using SortedSetDocValuesField

["Juraj Kucera (Jira)" <ji...@apache.org>]

Juraj Kucera created LUCENE-9017:
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             Summary: 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


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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