Github user anubhav100 commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1257#discussion_r134219416
--- Diff:
integration/presto/src/main/java/org/apache/carbondata/presto/processor/AbstractDataBlockIterator.java
---
@@ -0,0 +1,239 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.carbondata.presto.processor;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Future;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.apache.carbondata.common.CarbonIterator;
+import org.apache.carbondata.common.logging.LogService;
+import org.apache.carbondata.common.logging.LogServiceFactory;
+import org.apache.carbondata.core.datastore.DataRefNode;
+import org.apache.carbondata.core.datastore.FileHolder;
+import org.apache.carbondata.presto.scan.collector.ResultCollectorFactory;
+import org.apache.carbondata.core.scan.collector.ScannedResultCollector;
+import org.apache.carbondata.core.scan.executor.infos.BlockExecutionInfo;
+import org.apache.carbondata.core.scan.processor.BlockletIterator;
+import org.apache.carbondata.core.scan.processor.BlocksChunkHolder;
+import org.apache.carbondata.core.scan.result.AbstractScannedResult;
+import org.apache.carbondata.core.scan.result.vector.CarbonColumnarBatch;
+import org.apache.carbondata.core.scan.scanner.BlockletScanner;
+import org.apache.carbondata.core.scan.scanner.impl.FilterScanner;
+import org.apache.carbondata.core.scan.scanner.impl.NonFilterScanner;
+import org.apache.carbondata.core.stats.QueryStatisticsModel;
+
+/**
+ * This abstract class provides a skeletal implementation of the
+ * Block iterator.
+ */
+public abstract class AbstractDataBlockIterator extends
CarbonIterator<List<Object[]>> {
--- End diff --
only extending the core abstractdatatblockiterator will not solve our
problem,if i extend it then it will pick up result collector from core module
that is row based result collector which was initilized in its constructor
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