SpanQuery scoring inconsistencies
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Key: LUCENE-2880
URL: https://issues.apache.org/jira/browse/LUCENE-2880
Project: Lucene - Java
Issue Type: Bug
Reporter: Robert Muir
Fix For: 4.0
Spinoff of LUCENE-2879.
You can see a full description there, but the gist is that SpanQuery sums up
freqs with "sloppyFreq".
However this slop is simply spans.end() - spans.start()
For a SpanTermQuery for example, this means its scoring 0.5 for TF versus
TermQuery's 1.0.
As you can imagine, I think in practical situations this would make it
difficult for SpanQuery users to
really use SpanQueries for effective ranking, especially in combination with
non-Spanqueries (maybe via DisjunctionMaxQuery, etc)
The problem is more general than this simple example: for example SpanNearQuery
should be consistent with PhraseQuery's slop.
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