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From "Uwe Schindler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3643) Improve FilteredQuery to shortcut on wrapped MatchAllDocsQuery, null Query or null Filter
Date Tue, 13 Dec 2011 16:31:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168483#comment-13168483
] 

Uwe Schindler commented on LUCENE-3643:
---------------------------------------

I will commit the noBullQuerFilter.patch soon!
                
> Improve FilteredQuery to shortcut on wrapped MatchAllDocsQuery, null Query or null Filter
> -----------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3643
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3643
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/search
>    Affects Versions: 4.0
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 4.0
>
>         Attachments: LUCENE-3643-allowNullQueryFilter.patch, LUCENE-3643-noNullQueryFilter.patch,
LUCENE-3643.patch, LUCENE-3643.patch, LUCENE-3643.patch, LUCENE-3643.patch
>
>
> Since the rewrite of Lucene trunk to delegate all Filter logic to FilteredQuery, by simply
wrapping in IndexSearcher.wrapFilter(), we can do more short circuits and improve query execution.
A common use case it to pass MatchAllDocsQuery as query to IndexSearcher and a filter. For
the underlying hit collection this is stupid and slow, as MatchAllDocsQuery simply increments
the docID and checks acceptDocs. If the filter is sparse, this is a big waste. This patch
changes FilteredQuery.rewrite() to short circuit and return ConstantScoreQuery, if the query
is null or MatchAllDocs. The same happens for filter==null, in this case FilteredQuery rewrites
itsself to the inner query with modified boost.

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