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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 32115] New: - [PATCH] add boost feature to MultiFieldQueryParser
Date Mon, 08 Nov 2004 10:42:11 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=32115

[PATCH] add boost feature to MultiFieldQueryParser

           Summary: [PATCH] add boost feature to MultiFieldQueryParser
           Product: Lucene
           Version: 1.4
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Enhancement
          Priority: Other
         Component: QueryParser
        AssignedTo: lucene-dev@jakarta.apache.org
        ReportedBy: nicoo_@hotmail.com


add this feature
(field1:query)^bfield1 (field2:query)^bfield12 (field3:query)^bfield3 ...
(fieldx:query)^bfieldx

Google Example: a user search "coco"  , my defaults search fields are title and
description. But i would like boost title field more than description field to
have results more relevant.

Change in the MultiFieldQueryParser : add this method 

  public static Query parse(String query, String[] fields, int[] flags, float []
boost, Analyzer analyzer) throws ParseException {

    {
        BooleanQuery bQuery = new BooleanQuery();
        for (int i = 0; i < fields.length; i++)
        {
            Query q = parse(query, fields[i], analyzer);
==>         q.setBoost(boost[i]);
            int flag = flags[i];
            switch (flag)
            {
                case REQUIRED_FIELD:
                    bQuery.add(q, BooleanClause.Occur.MUST);
                    break;
                case PROHIBITED_FIELD:
                    bQuery.add(q, BooleanClause.Occur.MUST_NOT);
                    break;
                default:
                    bQuery.add(q, BooleanClause.Occur.SHOULD);
                    break;
            }
        }
        return bQuery;
    }
}

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