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https://issues.apache.org/jira/browse/LUCENE-3643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-3643:
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Description: 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 MatchAllDocs. (was: 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.)
Summary: Improve FilteredQuery to shortcut on wrapped MatchAllDocsQuery
(was: Improve FilteredQuery to shortcut on wrapped MatchAllDocsQuery, null
Query or null Filter)
> Improve FilteredQuery to shortcut on wrapped MatchAllDocsQuery
> --------------------------------------------------------------
>
> 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 MatchAllDocs.
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