Hello Mohammad,
the new queryscorer is able to rewrite the highlighting queries itself. You
have to allow it while creating it:
// Create token stream from the text you want to be highlighted. fieldName
is name of the field that is being highlighted
// only the relevant part of the query is used.
StringReader reader( text );
CachingTokenFilter tokenStream( analyzer.tokenStream( fieldName, &reader ),
true );
// set bAutoRewriteQueries=true to allow rewriting highlighting queries and
if you use only standard query objects
// use the default extractor
SpanHighlightScorer spanScorer( true );
// initialize the query scorer with the ORIGINAL query – NOT REWRITTEN
one. This query
// should contain the WildCardQuery, not the ConstantScoreQuery!
spanScorer.init( query, fieldName, &tokenStream );
// reset the token stream as it has been used by the scorer and we will
need it in the highlighter too
tokenStream.reset();
// Using the hilghlighter is the same as with the basis Highlight scorer:
// Instantiate it with formatter and scorer, set fragmenter and call one of
its methos, ie. getBestFragments
SimpleFragmenter fragmenter( fragmentSize );
Highlighter highlighter( &formatter, &spanScorer );
highlighter.setTextFragmenter( &fragmenter );
TCHAR * hilited = highlighter.getBestFragments( &tokenStream, text,
maxFragments, _T( "..." ));
The query will be rewritten within the call spanScorer.init(…) Typically, your
documents do not contain as many different words
that would match your wildcard query as the whole index and so the probability
that your query matches more than MAX CLAUSE
different words is much less.
Is it possible that your wildcard matches more than MAX CLAUSE different word
in one document?
Jiri
From: muhammad ismael [mailto:m.ismae...@gmail.com]
Sent: Monday, January 10, 2011 4:21 PM
To: clucene-developers@lists.sourceforge.net
Subject: Re: [CLucene-dev] CLucene-developers Digest, Vol 57, Issue 9
Hello Jiri,
I am sorry , it seems that i should read more in GIT. I got the
SpanHighlightScorer but how can i use it to highlight terms without warring
about the maxClauseCount ?
thank you
Mohammad Ismael
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