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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2754) add spanquery support for all multitermqueries
Date Thu, 11 Nov 2010 13:46:13 GMT
add spanquery support for all multitermqueries
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                 Key: LUCENE-2754
                 URL: https://issues.apache.org/jira/browse/LUCENE-2754
             Project: Lucene - Java
          Issue Type: New Feature
          Components: Search
            Reporter: Robert Muir
             Fix For: 4.0
         Attachments: LUCENE-2754.patch

I set fix version: 4.0, but possibly we could do this for 3.x too

Currently, we have a special SpanRegexQuery in contrib, and issues like LUCENE-522 open for
SpanFuzzyQuery.
The SpanRegexQuery in contrib is a little messy additionally.

For any arbitrary MultiTermQueries to work as a SpanQuery, there are only 3 requirements:
# The un-rewritten query must extend SpanQuery so it can be included in Span clauses
# The rewritten query should be SpanOrQuery instead of BooleanQuery
# The rewritten term clauses should be SpanTermQueries.

Instead of having logic like this for each query, i suggest adding two rewrite methods:
* ScoringSpanBoolean rewrite
* TopTermsSpanBoolean rewrite

as a start i wrote these up, and added a SpanMultiTermQueryWrapper that can be used to wrap
any multitermquery this way.
there are a few kinks, but I think the MTQ policeman can probably help get through them.


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