[jira] Created: (LUCENE-2752) EmptyTermSpans.toString() not overridden - throws NPE

["Sean O'Connor (JIRA)" <ji...@apache.org>]

EmptyTermSpans.toString() not overridden - throws NPE
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                 Key: LUCENE-2752
                 URL: https://issues.apache.org/jira/browse/LUCENE-2752
             Project: Lucene - Java
          Issue Type: Bug
          Components: Search
         Environment: Ubuntu 10.10, solr/lucene revision 1033666.
            Reporter: Sean O'Connor
            Priority: Minor


While trying to use lucene SpanQuery (e.g. SpanTermQuery) in a solr QueryComponent.process(), I got a NPE on the EmptySpanTerms.toString() method. 

I assume this should be overridden, with something, but not sure what. I just override and return "empty spans", but would assume something better should go there (empty string, null,...).

Interestingly, the error did not bubble up, so I spent a while thinking I had bad queries or test content. Queries just came back blank. After digging a bit, I noticed the 'embedded' error, and tracked down the source. With an overridden EST.toString() my span queries worked again. I have no idea what else depends on EST, or if overriding the toString() will cascade problems. 'ant test' in the lucene branch seemed to pass all tests (Build Successful). 

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