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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-560) NPE in SpanNear when used as exclusion for SpanNot
Date Tue, 16 May 2006 00:59:07 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-560?page=all ]
     
Hoss Man resolved LUCENE-560:
-----------------------------

    Resolution: Duplicate

> 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, 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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