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From 顿顿 <libo...@gmail.com>
Subject How groupingSearch specifies SortedNumericDocValuesField
Date Tue, 14 May 2019 17:18:48 GMT
When I use groupingSearch specified as SortedNumericDocValuesField,
I got an "unexpected docvalues type NUMERIC for field 'id'
(expected=SORTED)" Exception.

My code is as follows:
 String indexPath = "tmp/grouping";
        Analyzer standardAnalyzer = new StandardAnalyzer();
        Directory indexDir = FSDirectory.open(Paths.get(indexPath));
        IndexWriterConfig indexWriterConfig = new
IndexWriterConfig(standardAnalyzer);
        indexWriterConfig.setOpenMode(IndexWriterConfig.OpenMode.CREATE);
        IndexWriter masterIndex = new IndexWriter(indexDir,
indexWriterConfig);

        String name = "Tom";
        for (int i = 1; i < 5; i++) {
            Document doc = new Document();
            doc.add(new StringField("name", name + "_" + i,
Field.Store.YES));
            doc.add(new SortedNumericDocValuesField("id", i));
            doc.add(new StoredField("id", i));
            masterIndex.addDocument(doc);

        }
        masterIndex.commit();
        masterIndex.commit();

        IndexReader reader =
DirectoryReader.open(FSDirectory.open(Paths.get(indexPath)));
        IndexSearcher searcher = new IndexSearcher(reader);

        GroupingSearch groupingSearch = new GroupingSearch("id");
        TopGroups topGroups = groupingSearch.search(searcher, new
MatchAllDocsQuery(), 0, 100);

        System.out.println(topGroups.totalHitCount);
        reader.close();


The exception is as follows:
Exception in thread "main" java.lang.IllegalStateException: unexpected
docvalues type SORTED_NUMERIC for field 'id' (expected=SORTED). Re-index
with correct docvalues type.
at org.apache.lucene.index.DocValues.checkField(DocValues.java:317)
at org.apache.lucene.index.DocValues.getSorted(DocValues.java:369)
at
org.apache.lucene.search.grouping.TermGroupSelector.setNextReader(TermGroupSelector.java:56)
at
org.apache.lucene.search.grouping.FirstPassGroupingCollector.doSetNextReader(FirstPassGroupingCollector.java:348)
at
org.apache.lucene.search.SimpleCollector.getLeafCollector(SimpleCollector.java:33)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:643)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:443)
at
org.apache.lucene.search.grouping.GroupingSearch.groupByFieldOrFunction(GroupingSearch.java:141)
at
org.apache.lucene.search.grouping.GroupingSearch.search(GroupingSearch.java:113)


The version of Lucene I am using is 8.0.0.


Finally, I want to know how groupingSearch specifies three fields:
NumericDocValuesField, SortedNumericDocValuesField, SortedSetDocValuesField?




Thank you for your attention  to this  matter!

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