Le 12-mai-10 à 10:55, mark harwood a écrit :
two terminology questions:
- is multiplier in the mail mentioned there the same as boost?
This factor controls how many decimal places precision is retained
in the adjusted scores. Pick to low a multiplier and scores that are
only differentiated by a very small value will appear equal. Pick
too high a multiplier and you start to lose the most significant
parts of the score. This trade-off is summarised here for various
settings of "multiplier":
sorry, had overseen. Yes, that seems realistic to me.
- I intended to use prefix and fuzzyqueries. I believe this is
contradictory to this or?
You can wrap any queries with this class - the only limitation is it
hides all match info in a single byte encoded into the score which
only allows for 8 bits or 8 match flags i.e. reports on max 8
clauses. You could try use > 8 bits encoded into the score but then
you lose more score precision again (see above).
I'm having an NPE with the query who's toString gives:
QueryMatchMonitor (QueryMatchMonitor ((title-fr:segm~0.5 title-
phonetic-fr:SKM~0.5^0.8)) QueryMatchMonitor (((title-en:segm~0.5 title-
phonetic-en:SKM~0.5^0.8))^0.95) QueryMatchMonitor (((title-de:segm~0.5
title-phonetic-de:SKM~0.5^0.8))^0.9025) QueryMatchMonitor (((title-
en:segm~0.5 title-phonetic-en:SKM~0.5^0.8))^0.85737497))
at
java.lang.NullPointerException
at org.apache.lucene.search.FlagRecordingQuery
$FlagRecordingQueryWeight.scorer(FlagRecordingQuery.java:104)
at org.apache.lucene.search.BooleanQuery
$BooleanWeight.scorer(BooleanQuery.java:297)
at org.apache.lucene.search.FlagCombiningQuery
$FlagCombiningQueryWeight.scorer(FlagCombiningQuery.java:100)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:
246)
at org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:
173)
at org.apache.lucene.search.Searcher.search(Searcher.java:181)
at org.apache.lucene.search.Searcher.search(Searcher.java:191)
(but note that I removed explain from my FlagCombiningQuery; what's
null is the delegateScorer).
Any clue?
paul
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