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From "Robert Muir (JIRA)" <>
Subject [jira] Resolved: (LUCENE-2836) FieldCache rewrite method for MultiTermQueries
Date Tue, 04 Jan 2011 18:24:45 GMT


Robert Muir resolved LUCENE-2836.

    Resolution: Fixed
      Assignee: Robert Muir

Committed revision 1055130.

> FieldCache rewrite method for MultiTermQueries
> ----------------------------------------------
>                 Key: LUCENE-2836
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>             Fix For: 4.0
>         Attachments: LUCENE-2836.patch, LUCENE-2836.patch
> For some MultiTermQueries, like RangeQuery we have a FieldCacheRangeFilter etc (in this
case its particularly optimized).
> But in the general case, since LUCENE-2784 we can now have a rewrite method to rewrite
any MultiTermQuery 
> using the FieldCache, because MultiTermQuery's getEnum no longer takes IndexReader but
Terms, and all the 
> FilteredTermsEnums are now just real TermsEnum decorators.
> In cases like low frequency queries this is actually slower (I think this has been shown
for numeric ranges before too),
> but for the really high-frequency cases like especially ugly wildcards, regexes, fuzzies,
etc, this can be several times faster 
> using the FieldCache instead, since all the terms are in RAM and automaton can blast
through them quicker.

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