add c# version of FuzzyLikeThisQuery.java to contrib section
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Key: LUCENENET-23
URL: http://issues.apache.org/jira/browse/LUCENENET-23
Project: Lucene.Net
Issue Type: New Feature
Environment: n/a
Reporter: Marco Dissel
I've converted the FuzzeLikeThisQuery.java to c#... Maybe George can add this
to the contrib section?
original file is stored at :
http://svn.apache.org/viewvc/lucene/java/trunk/contrib/queries/src/java/org/apache/lucene/search/FuzzyLikeThisQuery.java?revision=413732&view=markup
Fuzzifies ALL terms provided as strings and then picks the best n
differentiating terms.
In effect this mixes the behaviour of FuzzyQuery and MoreLikeThis but with
special consideration of fuzzy scoring factors.
This generally produces good results for queries where users may provide
details in a number of fields and have no knowledge of boolean query syntax
and also want a degree of fuzzy matching and
a fast query.
For each source term the fuzzy variants are held in a BooleanQuery with no
coord factor (because we are not looking for matches on multiple variants in
any one doc). Additionally, a specialized
TermQuery is used for variants and does not use that variant term's IDF because
this would favour rarer terms eg misspellings. Instead, all variants use the
same IDF ranking (the one for the source query term) and this is factored into
the variant's boost. If the source query term does not exist in the index the
average IDF of the variants is used. @author maharwood
ps. there's no java test class...
Thanks
Marco
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