TopTermsScoringBooleanQueryRewrite minscore
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Key: LUCENE-2140
URL: https://issues.apache.org/jira/browse/LUCENE-2140
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Affects Versions: Flex Branch
Reporter: Robert Muir
Priority: Minor
Fix For: Flex Branch
when using the TopTermsScoringBooleanQueryRewrite (LUCENE-2123), it would be
nice if MultiTermQuery could set an attribute specifying the minimum required
score once the Priority Queue is filled.
This way, FilteredTermsEnums could adjust their behavior accordingly based on
the minimal score needed to actually be a useful term (i.e. not just pass thru
the pq)
An example is FuzzyTermsEnum: at some point the bottom of the priority queue
contains words with edit distance of 1 and enumerating any further terms is
simply a waste of time.
This is because terms are compared by score, then termtext. So in this case
FuzzyTermsEnum could simply seek to the exact match, then end.
This behavior could be also generalized for all n, for a different impl of
fuzzyquery where it is only looking in the term dictionary for words within
edit distance of n' which is the lowest scoring term in the pq (they adjust
their behavior during enumeration of the terms depending upon this attribute).
Other FilteredTermsEnums could make use of this minimal score in their own way,
to drive the most efficient behavior so that they do not waste time enumerating
useless terms.
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