[jira] [Created] (LUCENE-5455) Nested SpanNear queries lose positional highlights

["Steve Davids (JIRA)" <ji...@apache.org>]

Steve Davids created LUCENE-5455:
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             Summary: Nested SpanNear queries lose positional highlights
                 Key: LUCENE-5455
                 URL: https://issues.apache.org/jira/browse/LUCENE-5455
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/highlighter
    Affects Versions: 4.6.1, 4.3.1
            Reporter: Steve Davids
             Fix For: 4.8, 5.0


Given text of: "x y z x z x a"
With a query of: spanNear([spanNear([text:x, text:y, text:z], 0, true), text:a], 10, false)
Resulting highlight: <B>x</B> <B>y</B> <B>z</B> <B>x</B> <B>z</B> <B>x</B> <B>a</B>
Expected highlight: <B>x</B> <B>y</B> <B>z</B> x z x <B>a</B>

This is caused because WeightedSpanTermExtractor.extractWeightedSpanTerms takes the SpanQuery and flattens all terms and uses the positions from the outermost SpanNear clause (ignoring the nested SpanNear positions). I believe this could be resolved with a little recursion - walking the span query tree in the extractWeightedSpanTerms method.



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