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https://issues.apache.org/jira/browse/LUCENE-1374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-1374.
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Resolution: Fixed
Committed revision 691617.
> Merging of compressed string Fields may hit NPE
> -----------------------------------------------
>
> Key: LUCENE-1374
> URL: https://issues.apache.org/jira/browse/LUCENE-1374
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.4
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 2.4
>
> Attachments: LUCENE-1374.patch
>
>
> This bug was introduced with LUCENE-1219 (only present on 2.4).
> The bug happens when merging compressed string fields, but only if
> bulk-merging code does not apply because the FieldInfos for the segment being
> merged are not congruent. This test shows the bug:
> {code}
> public void testMergeCompressedFields() throws IOException {
> File indexDir = new File(System.getProperty("tempDir"),
> "mergecompressedfields");
> Directory dir = FSDirectory.getDirectory(indexDir);
> try {
> for(int i=0;i<5;i++) {
> // Must make a new writer & doc each time, w/
> // different fields, so bulk merge of stored fields
> // cannot run:
> IndexWriter w = new IndexWriter(dir, new WhitespaceAnalyzer(), i==0,
> IndexWriter.MaxFieldLength.UNLIMITED);
> w.setMergeFactor(5);
> w.setMergeScheduler(new SerialMergeScheduler());
> Document doc = new Document();
> doc.add(new Field("test1", "this is some data that will be compressed
> this this this", Field.Store.COMPRESS, Field.Index.NO));
> doc.add(new Field("test2", new byte[20], Field.Store.COMPRESS));
> doc.add(new Field("field" + i, "random field", Field.Store.NO,
> Field.Index.TOKENIZED));
> w.addDocument(doc);
> w.close();
> }
> byte[] cmp = new byte[20];
> IndexReader r = IndexReader.open(dir);
> for(int i=0;i<5;i++) {
> Document doc = r.document(i);
> assertEquals("this is some data that will be compressed this this
> this", doc.getField("test1").stringValue());
> byte[] b = doc.getField("test2").binaryValue();
> assertTrue(Arrays.equals(b, cmp));
> }
> } finally {
> dir.close();
> _TestUtil.rmDir(indexDir);
> }
> }
> {code}
> It's because in FieldsReader, when we load a field "for merge" we create a
> FieldForMerge instance which subsequently does not return the right values
> for getBinary{Value,Length,Offset}.
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