fix inverted logic

processing/src/main/java/io/druid/query/dimension/DefaultDimensionSpec.java

@@ -79,7 +79,7 @@ public class DefaultDimensionSpec implements DimensionSpec
   @Override
   public boolean preservesOrdering()
   {
-    return false;
+    return true;
   }
 
   @Override

processing/src/main/java/io/druid/query/topn/PooledTopNAlgorithm.java

@@ -116,7 +116,7 @@ public class PooledTopNAlgorithm
   {
     final TopNMetricSpecBuilder<int[]> arrayProvider = params.getArrayProvider();
 
-    if (query.getDimensionSpec().preservesOrdering()) {
+    if (!query.getDimensionSpec().preservesOrdering()) {
       return arrayProvider.build();
     }