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Posted to dev@lucene.apache.org by "Uwe Schindler (Updated) (JIRA)" <ji...@apache.org> on 2011/12/12 17:47:30 UTC
[jira] [Updated] (LUCENE-3643) Improve FilteredQuery to shortcut on
wrapped MatchAllDocsQuery, null Query or null Filter
[ https://issues.apache.org/jira/browse/LUCENE-3643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uwe Schindler updated LUCENE-3643:
----------------------------------
Attachment: LUCENE-3643.patch
Patch for trunk.
It also adds tests that checks for correctly rewritten queries with correct boosts (it assigns random boosts and checks the resulting query's boost).
> 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
>
>
> 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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