Improve FilteredQuery to shortcut on wrapped MatchAllDocsQuery, null Query or
null Filter
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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
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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