[jira] [Updated] (LUCENENET-598) NullReferenceException in DrillSideways.Search - ReqExclScorer.GetCost

["Simon Svensson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENENET-598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Svensson updated LUCENENET-598:
-------------------------------------
    Fix Version/s:     (was: Lucene.Net 4.8.0)

This is the same problem as reported in LUCENE-6001 and will be fixed in Lucene.Net 4.10. There's no fixVersion for that yet, so I'm removing the current 4.8 fixVersion.

> NullReferenceException in DrillSideways.Search - ReqExclScorer.GetCost
> ----------------------------------------------------------------------
>
>                 Key: LUCENENET-598
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-598
>             Project: Lucene.Net
>          Issue Type: Bug
>          Components: Lucene.Net.Facet
>    Affects Versions: Lucene.Net 4.8.0
>            Reporter: Harold Harkema
>            Priority: Major
>
> We have migrated all our Lucene 3.0 code to Lucene 4.8. However 
> when searching with DrillSideways.Search we sometimes get a NullReferenceException with this stacktrace:
> System.NullReferenceException: Object reference not set to an instance of an object.
>    at Lucene.Net.Search.ReqExclScorer.GetCost() in C:\BuildAgent\work\b1b63ca15b99dddb\src\Lucene.Net\Search\ReqExclScorer.cs:line 148
>    at Lucene.Net.Facet.DrillSidewaysScorer.Score(ICollector collector, Int32 maxDoc) in C:\BuildAgent\work\b1b63ca15b99dddb\src\Lucene.Net.Facet\DrillSidewaysScorer.cs:line 139
>    at Lucene.Net.Search.IndexSearcher.Search(IList`1 leaves, Weight weight, ICollector collector) in C:\BuildAgent\work\b1b63ca15b99dddb\src\Lucene.Net\Search\IndexSearcher.cs:line 649
>    at Lucene.Net.Facet.DrillSideways.Search(DrillDownQuery query, ICollector hitCollector) in C:\BuildAgent\work\b1b63ca15b99dddb\src\Lucene.Net.Facet\DrillSideways.cs:line 194
>    at Lucene.Net.Facet.DrillSideways.Search(ScoreDoc after, DrillDownQuery query, Int32 topN) in C:\BuildAgent\work\b1b63ca15b99dddb\src\Lucene.Net.Facet\DrillSideways.cs:line 249
> I managed to reproduce this in an unit test. If you add this unit test for example to TestDrillSideways.cs it will throw a NullReferenceException when running. This unit test should give 0 results because the criteria "Age != 23 AND Name == *e*" matches nothing. However I sometimes have the same issue when the query returns multiple results but that is currently a bit harder to reproduce in a unit test.
> {code}
>         [Test]
>         public virtual void TestFacetNRE()
>         {
>             Directory dir = NewDirectory();
>             Directory taxoDir = NewDirectory();
>             // Writes facet ords to a separate directory from the
>             // main index:
>             var taxoWriter = new DirectoryTaxonomyWriter(taxoDir, OpenMode.CREATE);
>             FacetsConfig config = new FacetsConfig();
>             RandomIndexWriter writer = new RandomIndexWriter(Random(), dir, Similarity, TimeZone);
>             Document doc = new Document();
>             doc.Add(new Field("Name", "John", Documents.StringField.TYPE_STORED));
>             doc.Add(new Field("Age", "19", Documents.StringField.TYPE_STORED));
>             doc.Add(new FacetField("Function", "Developer"));
>             writer.AddDocument(config.Build(taxoWriter, doc));
>             doc = new Document();
>             doc.Add(new Field("Name", "Steven", Documents.StringField.TYPE_STORED));
>             doc.Add(new Field("Age", "23", Documents.StringField.TYPE_STORED));
>             doc.Add(new FacetField("Function", "Sales"));
>             writer.AddDocument(config.Build(taxoWriter, doc));
>             // NRT open
>             IndexSearcher searcher = NewSearcher(writer.Reader);
>             // NRT open
>             var taxoReader = new DirectoryTaxonomyReader(taxoWriter);
>             DrillSideways ds = new DrillSideways(searcher, config, taxoReader);
>             var query = new BooleanQuery(true);
>             query.Add(new TermQuery(new Term("Age", "23")), Occur.MUST_NOT);
>             query.Add(new WildcardQuery(new Term("Name", "*e*")), Occur.MUST);
>             var mydrillDownQuery = new DrillDownQuery(config, query);
>             mydrillDownQuery.Add("Function", "Developer");
>             var z = ds.Search(mydrillDownQuery, null, null, 10, null, false, false);
>             IOUtils.Dispose(searcher.IndexReader, taxoReader, writer, taxoWriter, dir, taxoDir);
>         }
> {code}



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