GroupByQueryRunnerTest for hyperUnique finalizing post aggregators

processing/src/test/java/io/druid/query/groupby/GroupByQueryRunnerTest.java

@@ -3384,6 +3384,68 @@ public class GroupByQueryRunnerTest
     TestHelper.assertExpectedObjects(expectedResults, results, "");
   }
 
+  @Test
+  public void testSubqueryWithHyperUniquesPostAggregator()
+  {
+    GroupByQuery subquery = GroupByQuery
+        .builder()
+        .setDataSource(QueryRunnerTestHelper.dataSource)
+        .setQuerySegmentSpec(QueryRunnerTestHelper.firstToThird)
+        .setDimensions(Lists.<DimensionSpec>newArrayList())
+        .setAggregatorSpecs(
+            Arrays.asList(
+                QueryRunnerTestHelper.rowsCount,
+                new LongSumAggregatorFactory("idx", "index"),
+                new HyperUniquesAggregatorFactory("quality_uniques_inner", "quality_uniques")
+            )
+        )
+        .setPostAggregatorSpecs(
+            Arrays.<PostAggregator>asList(
+                new FieldAccessPostAggregator("quality_uniques_inner_post", "quality_uniques_inner")
+            )
+        )
+        .setGranularity(QueryRunnerTestHelper.dayGran)
+        .build();
+
+    GroupByQuery query = GroupByQuery
+        .builder()
+        .setDataSource(subquery)
+        .setQuerySegmentSpec(QueryRunnerTestHelper.firstToThird)
+        .setDimensions(Lists.<DimensionSpec>newArrayList())
+        .setAggregatorSpecs(
+            Arrays.asList(
+                new LongSumAggregatorFactory("rows", "rows"),
+                new LongSumAggregatorFactory("idx", "idx"),
+                new HyperUniquesAggregatorFactory("quality_uniques_outer", "quality_uniques_inner_post")
+            )
+        )
+        .setPostAggregatorSpecs(
+            Arrays.<PostAggregator>asList(
+                new HyperUniqueFinalizingPostAggregator("quality_uniques_outer_post", "quality_uniques_outer")
+            )
+        )
+        .setGranularity(QueryRunnerTestHelper.allGran)
+        .build();
+
+    List<Row> expectedResults = Arrays.asList(
+        GroupByQueryRunnerTestHelper.createExpectedRow(
+            "2011-04-01",
+            "rows",
+            26L,
+            "idx",
+            12446L,
+            "quality_uniques_outer",
+            9.019833517963864,
+            "quality_uniques_outer_post",
+            9.019833517963864
+        )
+    );
+
+    // Subqueries are handled by the ToolChest
+    Iterable<Row> results = GroupByQueryRunnerTestHelper.runQuery(factory, runner, query);
+    TestHelper.assertExpectedObjects(expectedResults, results, "");
+  }
+
   @Test
   public void testGroupByWithTimeColumn()
   {