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https://issues.apache.org/jira/browse/LUCENE-3643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167872#comment-13167872
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Uwe Schindler commented on LUCENE-3643:
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bq. I just have one question, should we really advertise that you can pass a
null Query to IndexSearcher?
I heard this question quite often, how to execute a solely Filter without
query. As the current API allows filter==null, why not the same for the query.
Passing null as filter and query of course makes no real sense, so I don't
expect this question.
I think it is harder for people to explain them that they must a) either wrap
the Filter with CSQ or b) must pass a MatchAllDocsQuery. If you tell them, just
call IndexSearcher.search() and pass either filter, query or both, then it's
much easier.
> 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.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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