proper toStrings of filters

processing/src/main/java/io/druid/query/filter/JavaScriptDimFilter.java

@@ -67,4 +67,13 @@ public class JavaScriptDimFilter implements DimFilter
         .put(functionBytes)
         .array();
   }
+
+  @Override
+  public String toString()
+  {
+    return "JavaScriptDimFilter{" +
+           "dimension='" + dimension + '\'' +
+           ", function='" + function + '\'' +
+           '}';
+  }
 }

processing/src/main/java/io/druid/query/filter/RegexDimFilter.java

@@ -69,4 +69,13 @@ public class RegexDimFilter implements DimFilter
         .put(patternBytes)
         .array();
   }
+
+  @Override
+  public String toString()
+  {
+    return "RegexDimFilter{" +
+           "dimension='" + dimension + '\'' +
+           ", pattern='" + pattern + '\'' +
+           '}';
+  }
 }

processing/src/main/java/io/druid/query/filter/SearchQueryDimFilter.java

@@ -64,9 +64,18 @@ public class SearchQueryDimFilter implements DimFilter
     final byte[] queryBytes = query.getCacheKey();
 
     return ByteBuffer.allocate(1 + dimensionBytes.length + queryBytes.length)
-        .put(DimFilterCacheHelper.SEARCH_QUERY_TYPE_ID)
-        .put(dimensionBytes)
-        .put(queryBytes)
-        .array();
+                     .put(DimFilterCacheHelper.SEARCH_QUERY_TYPE_ID)
+                     .put(dimensionBytes)
+                     .put(queryBytes)
+                     .array();
+  }
+
+  @Override
+  public String toString()
+  {
+    return "SearchQueryDimFilter{" +
+           "dimension='" + dimension + '\'' +
+           ", query=" + query +
+           '}';
   }
 }

processing/src/main/java/io/druid/query/filter/SpatialDimFilter.java

@@ -99,4 +99,13 @@ public class SpatialDimFilter implements DimFilter
     result = 31 * result + (bound != null ? bound.hashCode() : 0);
     return result;
   }
+
+  @Override
+  public String toString()
+  {
+    return "SpatialDimFilter{" +
+           "dimension='" + dimension + '\'' +
+           ", bound=" + bound +
+           '}';
+  }
 }