SOLR-595: Added support for Field level boosting in MoreLikeThis

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@668638 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -289,6 +289,8 @@ New Features
 51. SOLR-536: Add a DocumentObjectBinder to solrj that converts Objects to and
     from SolrDocuments.  (Noble Paul via ryan)
 
+52. SOLR-595: Add support for Field level boosting in the MoreLikeThis Handler.  (Tom Morton, gsingers)
+    
 Changes in runtime behavior
  1. SOLR-559: use Lucene updateDocument, deleteDocuments methods.  This
    removes the maxBufferedDeletes parameter added by SOLR-310 as Lucene

src/java/org/apache/solr/common/params/MoreLikeThisParams.java

@@ -35,6 +35,7 @@ public interface MoreLikeThisParams
   public final static String MAX_QUERY_TERMS       = PREFIX + "maxqt";
   public final static String MAX_NUM_TOKENS_PARSED = PREFIX + "maxntp";
   public final static String BOOST                 = PREFIX + "boost"; // boost or not?
+  public final static String QF                    = PREFIX + "qf"; //boosting applied to mlt fields
 
   // the /mlt request handler uses 'rows'
   public final static String DOC_COUNT = PREFIX + "count";

src/java/org/apache/solr/handler/MoreLikeThisHandler.java

@@ -23,8 +23,11 @@ import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Comparator;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Map;
+import java.util.Set;
 import java.util.regex.Pattern;
 
 import org.apache.lucene.document.Document;
@@ -37,6 +40,7 @@ import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.search.similar.MoreLikeThis;
 import org.apache.solr.common.SolrException;
 import org.apache.solr.common.params.CommonParams;
+import org.apache.solr.common.params.DisMaxParams;
 import org.apache.solr.common.params.FacetParams;
 import org.apache.solr.common.params.MoreLikeThisParams;
 import org.apache.solr.common.params.SolrParams;
@@ -51,7 +55,6 @@ import org.apache.solr.request.SolrQueryResponse;
 import org.apache.solr.schema.IndexSchema;
 import org.apache.solr.schema.SchemaField;
 import org.apache.solr.search.DocIterator;
-import org.apache.solr.search.DocSet;
 import org.apache.solr.search.DocList;
 import org.apache.solr.search.DocListAndSet;
 import org.apache.solr.search.QueryParsing;
@@ -131,7 +134,6 @@ public class MoreLikeThisHandler extends RequestHandlerBase
       // Matching options
       boolean includeMatch = params.getBool( MoreLikeThisParams.MATCH_INCLUDE, true );
       int matchOffset = params.getInt( MoreLikeThisParams.MATCH_OFFSET, 0 );
-      
       // Find the base match  
       Query query = QueryParsing.parseQuery(q, params.get(CommonParams.DF), params, req.getSchema());
       DocList match = searcher.getDocList(query, null, null, matchOffset, 1, flags ); // only get the first one...
@@ -231,6 +233,7 @@ public class MoreLikeThisHandler extends RequestHandlerBase
     final IndexReader reader;
     final SchemaField uniqueKeyField;
     final boolean needDocSet;
+    Map<String,Float> boostFields;
     
     Query mltquery;  // expose this for debugging
     
@@ -260,12 +263,27 @@ public class MoreLikeThisHandler extends RequestHandlerBase
       mlt.setMaxQueryTerms(     params.getInt(MoreLikeThisParams.MAX_QUERY_TERMS,       MoreLikeThis.DEFAULT_MAX_QUERY_TERMS));
       mlt.setMaxNumTokensParsed(params.getInt(MoreLikeThisParams.MAX_NUM_TOKENS_PARSED, MoreLikeThis.DEFAULT_MAX_NUM_TOKENS_PARSED));
       mlt.setBoost(            params.getBool(MoreLikeThisParams.BOOST, false ) );
+      boostFields = SolrPluginUtils.parseFieldBoosts(params.getParams(MoreLikeThisParams.QF));
+    }
+    
+    private void setBoosts(Query mltquery) {
+      if (boostFields.size() > 0) {
+        List clauses = ((BooleanQuery)mltquery).clauses();
+        for( Object o : clauses ) {
+          TermQuery q = (TermQuery)((BooleanClause)o).getQuery();
+          Float b = this.boostFields.get(q.getTerm().field());
+          if (b != null) {
+            q.setBoost(b*q.getBoost());
+          }
+        }
+      }
     }
     
     public DocListAndSet getMoreLikeThis( int id, int start, int rows, List<Query> filters, List<InterestingTerm> terms, int flags ) throws IOException
     {
       Document doc = reader.document(id);
       mltquery = mlt.like(id);
+      setBoosts(mltquery);
       if( terms != null ) {
         fillInterestingTermsFromMLTQuery( mltquery, terms );
       }
@@ -289,6 +307,7 @@ public class MoreLikeThisHandler extends RequestHandlerBase
     public DocListAndSet getMoreLikeThis( Reader reader, int start, int rows, List<Query> filters, List<InterestingTerm> terms, int flags ) throws IOException
     {
       mltquery = mlt.like(reader);
+      setBoosts(mltquery);
       if( terms != null ) {
         fillInterestingTermsFromMLTQuery( mltquery, terms );
       }

src/test/org/apache/solr/handler/MoreLikeThisHandlerTest.java

@@ -21,11 +21,15 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;
 
+import org.apache.solr.common.params.CommonParams;
+import org.apache.solr.common.params.MoreLikeThisParams;
 import org.apache.solr.common.params.MultiMapSolrParams;
 import org.apache.solr.common.params.SolrParams;
 import org.apache.solr.common.util.ContentStream;
 import org.apache.solr.common.util.ContentStreamBase;
 import org.apache.solr.core.SolrCore;
+import org.apache.solr.request.LocalSolrQueryRequest;
+import org.apache.solr.request.SolrQueryRequest;
 import org.apache.solr.request.SolrQueryRequestBase;
 import org.apache.solr.request.SolrQueryResponse;
 import org.apache.solr.util.AbstractSolrTestCase;
@@ -43,6 +47,7 @@ public class MoreLikeThisHandlerTest extends AbstractSolrTestCase {
     lrf = h.getRequestFactory("standard", 0, 20 );
   }
   
+  
   public void testInterface()
   {
     SolrCore core = h.getCore();
@@ -67,5 +72,35 @@ public class MoreLikeThisHandlerTest extends AbstractSolrTestCase {
       mlt.handleRequestBody( req, new SolrQueryResponse() );
     }
     catch( Exception ex ) {} // expected
+    
+    assertU(adoc(new String[]{"id","42","name","Tom Cruise","subword","Top Gun","subword","Risky Business","subword","The Color of Money","subword","Minority Report","subword", "Days of Thunder","subword", "Eyes Wide Shut","subword", "Far and Away"}));
+    assertU(adoc(new String[]{"id","43","name","Tom Hanks","subword","The Green Mile","subword","Forest Gump","subword","Philadelphia Story","subword","Big","subword","Cast Away"}));
+    assertU(adoc(new String[]{"id","44","name","Harrison Ford","subword","Star Wars","subword","Indiana Jones","subword","Patriot Games","subword","Regarding Henry"}));
+    assertU(adoc(new String[]{"id","45","name","George Harrison","subword","Yellow Submarine","subword","Help","subword","Magical Mystery Tour","subword","Sgt. Peppers Lonley Hearts Club Band"}));
+    assertU(adoc(new String[]{"id","46","name","Nicole Kidman","subword","Batman","subword","Days of Thunder","subword","Eyes Wide Shut","subword","Far and Away"}));
+    assertU(commit());
+
+    params.put(CommonParams.Q, new String[]{"id:42"});
+    params.put(MoreLikeThisParams.MLT, new String[]{"true"});
+    params.put(MoreLikeThisParams.SIMILARITY_FIELDS, new String[]{"name,subword"});
+    params.put(MoreLikeThisParams.INTERESTING_TERMS,new String[]{"details"});
+    params.put(MoreLikeThisParams.MIN_TERM_FREQ,new String[]{"1"});
+    params.put(MoreLikeThisParams.MIN_DOC_FREQ,new String[]{"1"});
+    
+    SolrQueryRequest mltreq = new LocalSolrQueryRequest( core, (SolrParams)mmparams);
+    assertQ("morelikethis - tom cruise",mltreq
+        ,"//result/doc[1]/int[@name='id'][.='46']"
+        ,"//result/doc[2]/int[@name='id'][.='43']");
+    
+    params.put(CommonParams.Q, new String[]{"id:44"});
+    assertQ("morelike this - harrison ford",mltreq
+        ,"//result/doc[1]/int[@name='id'][.='45']");
+    
+    params.put(CommonParams.Q, new String[]{"id:42"}); 
+    params.put(MoreLikeThisParams.QF,new String[]{"name^5.0 subword^0.1"});
+    assertQ("morelikethis with weights",mltreq
+        ,"//result/doc[1]/int[@name='id'][.='43']"
+        ,"//result/doc[2]/int[@name='id'][.='46']");
+    
   }
 }