Index: /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/search/Query.java
===================================================================
--- /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/search/Query.java	(Revision 191360)
+++ /home/dnaber/workspace/LuceneSVN/src/java/org/apache/lucene/search/Query.java	(Arbeitskopie)
@@ -108,12 +108,22 @@
    * {@link #createWeight(Searcher)} implementation.
    */
   public Query combine(Query[] queries) {
-        for (int i = 0; i < queries.length; i++) {
-            if (!this.equals(queries[i])) {
-                throw new IllegalArgumentException();
-            }
-        }
-        return this;
+    boolean buildNewQuery = false;
+    for (int i = 0; i < queries.length; i++) {
+      if (!this.equals(queries[i])) {
+        buildNewQuery = true;
+        break;
+      }
+    }
+    if (buildNewQuery) {
+      BooleanQuery bQuery = new BooleanQuery();
+      for (int i = 0; i < queries.length; i++) {
+        bQuery.add(queries[i], BooleanClause.Occur.SHOULD);
+      }
+      return bQuery;
+    } else {
+      return this;
+    }
   }
 
   /**