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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2010/12/28 06:04:45 UTC
[jira] Created: (LUCENE-2835) FieldCache rewrite method for
MultiTermQueries
FieldCache rewrite method for MultiTermQueries
----------------------------------------------
Key: LUCENE-2835
URL: https://issues.apache.org/jira/browse/LUCENE-2835
Project: Lucene - Java
Issue Type: New Feature
Reporter: Robert Muir
Fix For: 4.0
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 ones like especially ugly wildcards, regexes, fuzzies this can be many times faster
using the FieldCache instead, since all the terms are in RAM and automaton can blast through them quicker.
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[jira] Resolved: (LUCENE-2835) FieldCache rewrite method for
MultiTermQueries
Posted by "Robert Muir (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-2835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Muir resolved LUCENE-2835.
---------------------------------
Resolution: Duplicate
sorry, JIRA puked and i ended up with a duplicate issue.
> FieldCache rewrite method for MultiTermQueries
> ----------------------------------------------
>
> Key: LUCENE-2835
> URL: https://issues.apache.org/jira/browse/LUCENE-2835
> Project: Lucene - Java
> Issue Type: New Feature
> Reporter: Robert Muir
> Fix For: 4.0
>
>
> 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 ones like especially ugly wildcards, regexes, fuzzies this can be many times faster
> using the FieldCache instead, since all the terms are in RAM and automaton can blast through them quicker.
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