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From Joel Halbert <j...@su3analytics.com>
Subject RE: FastVectorHighlighter.getBestFragments returning null
Date Fri, 27 May 2011 12:04:53 GMT
Hi Pierre,

Thanks for the pointer. So if I understand correctly this bug definitely
applies to fields with TermVector.WITH_OFFSETS.

My field uses TermVector.WITH_POSITIONS_OFFSETS)

I wasn't sure from the bug report if it applies to
WITH_POSITIONS_OFFSETS as well? It looks like it might?

- Joel

On Fri, 2011-05-27 at 13:56 +0200, Pierre GOSSE wrote:

> Hi,
> 
> Maybe is it related to :
> https://issues.apache.org/jira/browse/LUCENE-3087
> 
> Pierre
> 
> -----Message d'origine-----
> De : Joel Halbert [mailto:joel@su3analytics.com] 
> Envoyé : vendredi 27 mai 2011 12:57
> À : lucene users
> Objet : FastVectorHighlighter.getBestFragments returning null
> 
> Hi,
> 
> I'm using Lucene 3.0.3. I'm extracting snippets using
> FastVectorHighlighter, for some snippets (I think always when searching
> for exact matches, quoted) the fragment is null.
> 
> Code looks like:
> 
> 
> 			query = QueryParser.escape(query);
> 			if (exact) {
> 				query = "\""+query+"\"";
> 			}
>                         BooleanQuery allQ = new BooleanQuery();
> 			Query bodyQ = new QueryParser(Version.LUCENE_30, BODY, analyser).parse(query);
> 			termQ.add(new BooleanClause(bodyQ, Occur.SHOULD));
>                         // add more queries
>                         allQ.add(new BooleanClause(termQ, Occur.MUST));
>                         
> 			TopDocs res = is.search(allQ, null, upperRange);	
> 			FastVectorHighlighter highlighter = new FastVectorHighlighter(true, true);
> 			
> 			for (int i = in.getLowerRange(); i < Math.min(res.totalHits, upperRange); i++)
{
> 
>                            	String[] bodyFrags =
> 						highlighter.getBestFragments(highlighter.getFieldQuery(bodyQ),
> 						is.getIndexReader(), res.scoreDocs[i].doc, BODY, 120, 2);
>                 
>                                 // bodyFrags is null
>                     }
> 
> 
> I do get a hit, and the content with the exact match is coming from the
> BODY field, but I cann't seem to get the fragment out.
> 
> Any clues,
> 
> Thanks
> 
> - Joel



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