getPayloadSpans on org.apache.lucene.search.spans should be abstract
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                 Key: LUCENE-1748
                 URL: https://issues.apache.org/jira/browse/LUCENE-1748
             Project: Lucene - Java
          Issue Type: Bug
          Components: Query/Scoring
    Affects Versions: 2.4.1, 2.4
         Environment: all
            Reporter: Hugh Cayless
             Fix For: 2.4.2


I just spent a long time tracking down a bug resulting from upgrading to Lucene 
2.4.1 on a project that implements some SpanQuerys of its own and was written 
against 2.3.  Since the project's SpanQuerys didn't implement getPayloadSpans, 
the call to that method went to SpanQuery.getPayloadSpans which returned null 
and caused a NullPointerException in the Lucene code, far away from the actual 
source of the problem.  

It would be much better for this kind of thing to show up at compile time, I 
think.

Thanks!

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