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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2754) add spanquery support for all multitermqueries
Date Thu, 11 Nov 2010 15:25:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931041#action_12931041
] 

Uwe Schindler commented on LUCENE-2754:
---------------------------------------

What about the third BQ rewrite mode (is it needed or is scoring different (we have two rerwite
modes for fuzzy)?

> add spanquery support for all multitermqueries
> ----------------------------------------------
>
>                 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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