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Date: Thu, 16 Apr 2009 04:45:15 -0700 (PDT)
From: "Uwe Schindler (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-1603) Changes for TrieRange in
 FilteredTermEnum and MultiTermQuery improvement
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    [ https://issues.apache.org/jira/browse/LUCENE-1603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699654#action_12699654 ] 

Uwe Schindler commented on LUCENE-1603:
---------------------------------------

Do you think the name is good? MultiTermQueryWrapperFilter or simplier MultiTermFilter? Its not really one of both, its a mix between wrapper and the real filter: It wraps the query, but does the getDocIdSet and TermEnums himself.

> Changes for TrieRange in FilteredTermEnum and MultiTermQuery improvement
> ------------------------------------------------------------------------
>
>                 Key: LUCENE-1603
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1603
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.4, 2.9
>            Reporter: Uwe Schindler
>            Assignee: Michael McCandless
>             Fix For: 2.9
>
>         Attachments: LUCENE-1603.patch, LUCENE-1603.patch, LUCENE-1603.patch
>
>
> This is a patch, that is needed for the MultiTermQuery-rewrite of TrieRange (LUCENE-1602):
> - Make the private members protected, to have access to them from the very special TrieRangeTermEnum 
> - Fix a small inconsistency (docFreq() now only returns a value, if a valid term is existing)
> - Improvement of MultiTermFilter.getDocIdSet to return DocIdSet.EMPTY_DOCIDSET, if the TermEnum is empty (less memory usage) and faster.
> - Add the getLastNumberOfTerms() to MultiTermQuery for statistics on different multi term queries and how may terms they affect, using this new functionality, the improvement of TrieRange can be shown (extract from test case there, 10000 docs index, long values):
> {code}
> [junit] Average number of terms during random search on 'field8':
> [junit]  Trie query: 244.2
> [junit]  Classical query: 3136.94
> [junit] Average number of terms during random search on 'field4':
> [junit]  Trie query: 38.3
> [junit]  Classical query: 3018.68
> [junit] Average number of terms during random search on 'field2':
> [junit]  Trie query: 18.04
> [junit]  Classical query: 3539.42
> {code}
> All core tests pass.

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