Hi,
according to the LiA book the FuzzyQuery distance is computed as
1- distance / min(textlen,targetlen)
Given
def addDoc(text, writer):
doc = Document()
doc.add(Field("field", text,
Field.Store.YES, Field.Index.TOKENIZED))
writer.addDocument(doc)
addDoc("aaaaa", writer)
addDoc("aaaab", writer)
addDoc("aaabb", writer)
addDoc("aabbb", writer)
addDoc("abbbb", writer)
addDoc("bbbbb", writer)
addDoc("ddddd", writer)
query = FuzzyQuery(Term("field", "aaaaa"),0.8,0)
should find "aaaab' since we have
distance = 1
min(textlen,targetlen) = 5
It does find it with
query = FuzzyQuery(Term("field", "aaaaa"),0.79,0)
though.
Is there a rounding error bug?
(this is with lucene-java-2.2.0-603782)
Helmut Jarausch
Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany
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