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From vsevel <v.se...@lombardodier.com>
Subject RE: Distinct terms values? (like in Luke)
Date Mon, 26 Oct 2009 09:23:11 GMT

Does it work for numeric fields too? I am working with 2.9.0 and the
following code gives extra values:

    @Test
    public void distinct() throws Exception {
        RAMDirectory directory = new RAMDirectory();
        IndexWriter writer = new IndexWriter(directory, new
WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.UNLIMITED);

        for (int l = -2; l <= 2; l++) {
            Document doc = new Document();
            doc.add(new Field("text", "the big brown", Field.Store.NO,
Field.Index.ANALYZED));
            doc.add(new NumericField("trie", Field.Store.NO,
true).setIntValue(l));
            writer.addDocument(doc);
        }

        writer.close();

        IndexReader reader = IndexReader.open(directory, true);
        TermEnum termEnum = reader.terms(new Term("trie", ""));
        Term next = termEnum.term();
        List<Integer> ints = new ArrayList<Integer>();

        while (next != null && next.field().equals("trie")) {
            ints.add(NumericUtils.prefixCodedToInt(next.text()));
            next = termEnum.next() ? termEnum.term() : null;
        }

       reader.close();

        log.info(ints.toString());
    }

==> [-2, -1, 0, 1, 2, -16, 0, -256, 0, -4096, 0, -65536, 0, -1048576, 0,
-16777216, 0, -268435456, 0]

Is there a way to make this work?


Uwe Schindler wrote:
> 
> You can get this list using IndexReader.terms(new Term(fieldname,"")).
> This
> returns an enumeration of all terms starting with the given one (the field
> name). Just iterate over the TermEnum util the field name of the iterated
> term changes.
> 
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
> 
-- 
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