diff --git a/extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchMergeAggregatorFactory.java b/extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchMergeAggregatorFactory.java
index cefed40b20e..cf5729e17d2 100644
--- a/extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchMergeAggregatorFactory.java
+++ b/extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchMergeAggregatorFactory.java
@@ -86,7 +86,7 @@ public class SketchMergeAggregatorFactory extends SketchAggregatorFactory
           name,
           Math.max(size, castedOther.size),
           shouldFinalize,
-          true,
+          false,
           errorBoundsStdDev
       );
     } else {
diff --git a/processing/src/test/java/io/druid/query/aggregation/AggregationTestHelper.java b/processing/src/test/java/io/druid/query/aggregation/AggregationTestHelper.java
index 9b5a20df901..3e62ac393c8 100644
--- a/processing/src/test/java/io/druid/query/aggregation/AggregationTestHelper.java
+++ b/processing/src/test/java/io/druid/query/aggregation/AggregationTestHelper.java
@@ -69,7 +69,7 @@ import io.druid.segment.IndexSpec;
 import io.druid.segment.QueryableIndex;
 import io.druid.segment.QueryableIndexSegment;
 import io.druid.segment.Segment;
-import io.druid.segment.TestHelper;
+import io.druid.segment.column.ColumnConfig;
 import io.druid.segment.incremental.IncrementalIndex;
 import io.druid.segment.incremental.OnheapIncrementalIndex;
 import org.apache.commons.io.IOUtils;
@@ -164,10 +164,22 @@ public class AggregationTestHelper
         pool
     );
 
+    IndexIO indexIO = new IndexIO(
+        mapper,
+        new ColumnConfig()
+        {
+          @Override
+          public int columnCacheSizeBytes()
+          {
+            return 0;
+          }
+        }
+    );
+
     return new AggregationTestHelper(
         mapper,
-        TestHelper.getTestIndexMerger(),
-        TestHelper.getTestIndexIO(),
+        new IndexMerger(mapper, indexIO),
+        indexIO,
         toolchest,
         factory,
         tempFolder,
@@ -196,10 +208,22 @@ public class AggregationTestHelper
         QueryRunnerTestHelper.NOOP_QUERYWATCHER
     );
 
+    IndexIO indexIO = new IndexIO(
+        mapper,
+        new ColumnConfig()
+        {
+          @Override
+          public int columnCacheSizeBytes()
+          {
+            return 0;
+          }
+        }
+    );
+
     return new AggregationTestHelper(
         mapper,
-        TestHelper.getTestIndexMerger(),
-        TestHelper.getTestIndexIO(),
+        new IndexMerger(mapper, indexIO),
+        indexIO,
         toolchest,
         factory,
         tempFolder,