rewrite turns
foo*
into
food foot football ...
etc. Those variant terms are found by looking in the index, hence the need for
the IndexReader.
Searcher calls rewrite on queries to do this - the highlighter just pre-empts
this conversion and sneaks a peek at the terms generated so it can do its job
more efficiently.
----- Original Message ----
From: Helmut Jarausch <[EMAIL PROTECTED]>
To: [email protected]
Sent: Thursday, 13 December, 2007 11:40:01 AM
Subject: Query.rewrite - help me to understand it
Hi,
since I need highlighting, I need to 'rewrite' a query.
Query.rewrite takes an object of type IndexReader
But what for?
As I understand it, rewrite transforms a possibly complicated
query into an simplified (internal?) form which is (unfortunately)
needed by QueryScorer which is in turn need by Highlighter.
What does Query.rewrite do and why does it need access to the
index?
Many thanks for an explanation,
Helmut.
--
Helmut Jarausch
Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany
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