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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2836) FieldCache rewrite method for MultiTermQueries
Date Tue, 28 Dec 2010 13:12:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975496#action_12975496
] 

Robert Muir commented on LUCENE-2836:
-------------------------------------

The question is, does it really works correct with multivalued fields?

of course not, its no different than any of the other fieldcache*filter stuff we have now.
except that stuff is an aweful lot more code... do we really need all those specializations
in fieldcacherangefilter?


> FieldCache rewrite method for MultiTermQueries
> ----------------------------------------------
>
>                 Key: LUCENE-2836
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2836
>             Project: Lucene - Java
>          Issue Type: New Feature
>            Reporter: Robert Muir
>             Fix For: 4.0
>
>         Attachments: 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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