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From Nitin Arora <ARO_NI...@YAHOO.COM>
Subject Highlighting does not work with PayloadTermQueries
Date Mon, 20 Feb 2012 22:25:09 GMT
Hi,

I'm using SOLR and Lucene in my application for search.

I'm facing an issue of highlighting using FastVectorHighlighter not working
when I use PayloadTermQueries as clauses of a BooleanQuery.

After Debugging I found that In DefaultSolrHighlighter.Java,
fvh.getFieldQuery does not return any term in the termMap.

FastVectorHighlighter fvh = new FastVectorHighlighter(
        // FVH cannot process hl.usePhraseHighlighter parameter per-field
basis
        params.getBool( HighlightParams.USE_PHRASE_HIGHLIGHTER, true ),
        // FVH cannot process hl.requireFieldMatch parameter per-field basis
        params.getBool( HighlightParams.FIELD_MATCH, false ) );

*FieldQuery fieldQuery = fvh.getFieldQuery( query );*

The reason of empty termmap is, PayloadTermQuery is discarded while
constructing the FieldQuery.

void flatten( Query sourceQuery, Collection<Query> flatQueries ){
    if( sourceQuery instanceof BooleanQuery ){
      BooleanQuery bq = (BooleanQuery)sourceQuery;
      for( BooleanClause clause : bq.getClauses() ){
        if( !clause.isProhibited() )
          flatten( clause.getQuery(), flatQueries );
      }
    }
    else if( sourceQuery instanceof DisjunctionMaxQuery ){
      DisjunctionMaxQuery dmq = (DisjunctionMaxQuery)sourceQuery;
      for( Query query : dmq ){
        flatten( query, flatQueries );
      }
    }
    else if( sourceQuery instanceof TermQuery ){
      if( !flatQueries.contains( sourceQuery ) )
        flatQueries.add( sourceQuery );
    }
    else if( sourceQuery instanceof PhraseQuery ){
      if( !flatQueries.contains( sourceQuery ) ){
        PhraseQuery pq = (PhraseQuery)sourceQuery;
        if( pq.getTerms().length > 1 )
          flatQueries.add( pq );
        else if( pq.getTerms().length == 1 ){
          flatQueries.add( new TermQuery( pq.getTerms()[0] ) );
        }
      }
    }
    // else discard queries
  }

What is the best way to get highlighting working with Payload Term Queries?

Thanks
Nitin

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