[jira] [Created] (LUCENE-7151) Nested spanNear scoring error when inner clauses overlap positions

["David Wendt (JIRA)" <ji...@apache.org>]

David Wendt created LUCENE-7151:
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             Summary: Nested spanNear scoring error when inner clauses overlap positions
                 Key: LUCENE-7151
                 URL: https://issues.apache.org/jira/browse/LUCENE-7151
             Project: Lucene - Core
          Issue Type: Bug
          Components: core/query/scoring
    Affects Versions: 5.5, 5.3.1
         Environment: Windows, Linux
            Reporter: David Wendt


For spanNear([spanNear([contents:word1, contents:word3], 2, true), spanNear([contents:word2, contents:word3], 2, true)], 2, false)

Scores for the following two documents should be the same but are not.
doc1: [----- word1 word2 ----- word2 word3 ----- word1 word2 word3 -----]
doc2: [----- word2 word3 ----- word1 word3 ----- word1 word2 word3 -----]

The positions of the inner clauses effect the scoring for the of the final 3-term phrase. This appears to be a side-effect of the span-scoring rewrite in 5.2(?). 

The SpansCell.adjustMax() uses end-position values to decide maxEndPositionCell while the SpanPositionQueue uses start-position and end-position values to sort the SpanCells. This means that maxEndPositionCell will be incorrectly set or not set depending on previous positions.

I can provide example code illustrating the score error.



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