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Message-ID: <20060925165449.41251.qmail@web26001.mail.ukl.yahoo.com>
Date: Mon, 25 Sep 2006 16:54:49 +0000 (GMT)
From: mark harwood <markharw00d@yahoo.co.uk>
Reply-To: mark harwood <markharw00d@yahoo.co.uk>
Subject: RangeQuery - rewrite to a RangeFilter in a ConstantScoreQuery?
To: javadev <java-dev@lucene.apache.org>
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Given the trouble people routinely get themselves into using RangeQuery would it make sense to change the "rewrite" method to generate a ConstantScoreQuery wrapping a RangeFilter?

The only disadvantages I can see would be:

1) Scoring would change - some users may find their apps produce different scores for queries which they have tuned "match thresholds" for.
2) Highlighting would not work for RangeQueries (not something I would normally see as useful)
3) Explain() would not work the same


This is to be weighed up against the advantages of:

1) Faster queries for most users (see method 1 vs method 4 in http://wiki.apache.org/jakarta-lucene/FilteringOptions - 4 times faster in that benchmark)
2) No more "too many clauses" exceptions foxing end users
3) Scoring would change - normally for the better. The IDF of terms produced by the range query is no longer a factor that skews results eg scenarios where the Sundays in a date range typically rank higher because less documents are posted on that day.

The change wouldn't break the API and therefore require changes to people's client code.

Thoughts?


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