FieldCache rewrite method for MultiTermQueries
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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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