NPE in SpanNear when used as exclusion for SpanNot
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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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