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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-560) NPE in SpanNear when used as exclusion for SpanNot
Date Mon, 01 May 2006 18:15:47 GMT
NPE in SpanNear when used as exclusion for SpanNot
--------------------------------------------------

         Key: LUCENE-560
         URL: http://issues.apache.org/jira/browse/LUCENE-560
     Project: Lucene - Java
        Type: Bug

  Components: Search  
    Reporter: Hoss Man
 Attachments: LUCENE-560-test.patch

It seems that if you try to use a SpanNear query as the "exclude" argument to a SpanNot query,
you encounter an NPE.  The stack trace looks like the following (as of trunk r398639) ...

    [junit] java.lang.NullPointerException
    [junit]     at org.apache.lucene.search.spans.NearSpans.doc(NearSpans.java:227)
    [junit]     at org.apache.lucene.search.spans.SpanNotQuery$1.next(SpanNotQuery.java:85)
    [junit]     at org.apache.lucene.search.spans.SpanScorer.next(SpanScorer.java:51)
    [junit]     at org.apache.lucene.search.Scorer.score(Scorer.java:47)
    [junit]     at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:132)

patch to TestBasics demonstrating bug will be attached shortly.  I believe the problem is
that SpanNotQuery$1 is calling "excludeSpans.doc()" without ever calling "excludeSpans.next()"
... this "works" when the exclude query is a TermQuery becuase the value returned by doc()
is -1 ... but with SpanNearQuery tries to pop the initial value off of a queue which hasn't
been initialized yet.

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