akkio-97 commented on a change in pull request #3773:
URL: https://github.com/apache/carbondata/pull/3773#discussion_r462856584



##########
File path: 
integration/presto/src/main/prestosql/org/apache/carbondata/presto/readers/ArrayStreamReader.java
##########
@@ -0,0 +1,145 @@
+/*
+ * 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.readers;
+
+import io.prestosql.spi.type.*;
+
+import org.apache.carbondata.core.metadata.datatype.DataType;
+import org.apache.carbondata.core.metadata.datatype.DataTypes;
+import org.apache.carbondata.core.metadata.datatype.StructField;
+import 
org.apache.carbondata.core.scan.result.vector.impl.CarbonColumnVectorImpl;
+
+import io.prestosql.spi.block.Block;
+import io.prestosql.spi.block.BlockBuilder;
+
+import org.apache.carbondata.presto.CarbonVectorBatch;
+
+/**
+ * Class to read the Array Stream
+ */
+
+public class ArrayStreamReader extends CarbonColumnVectorImpl implements 
PrestoVectorBlockBuilder {
+
+  protected int batchSize;
+
+  protected Type type;
+  protected BlockBuilder builder;
+  Block childBlock = null;
+  private int index = 0;
+
+  public ArrayStreamReader(int batchSize, DataType dataType, StructField 
field) {
+    super(batchSize, dataType);
+    this.batchSize = batchSize;
+    this.type = getArrayOfType(field, dataType);
+    setChildrenVector(
+        CarbonVectorBatch.createDirectStreamReader(this.batchSize, 
field.getDataType(), field));
+    this.builder = type.createBlockBuilder(null, batchSize);
+  }
+
+  public int getIndex() {
+    return index;
+  }
+
+  public void setIndex(int index) {
+    this.index = index;
+  }
+
+  public String getDataTypeName() {
+    return "ARRAY";
+  }
+
+  Type getArrayOfType(StructField field, DataType dataType) {
+    if (dataType == DataTypes.STRING) {
+      return new ArrayType(VarcharType.VARCHAR);
+    } else if (dataType == DataTypes.INT) {
+      return new ArrayType(IntegerType.INTEGER);
+    } else if (dataType == DataTypes.LONG) {
+      return new ArrayType(BigintType.BIGINT);
+    } else if (dataType == DataTypes.DOUBLE) {
+      return new ArrayType(DoubleType.DOUBLE);
+    } else if (dataType == DataTypes.FLOAT) {
+      return new ArrayType(RealType.REAL);
+    } else if (dataType == DataTypes.BOOLEAN) {
+      return new ArrayType(BooleanType.BOOLEAN);
+    } else {
+      StructField childField = field.getChildren().get(0);
+      return new ArrayType(getArrayOfType(childField, 
childField.getDataType()));
+    }
+  }
+
+  @Override
+  public Block buildBlock() {
+    return builder.build();
+  }
+
+  public boolean isComplex() {
+    return true;
+  }
+
+  @Override
+  public void setBatchSize(int batchSize) {
+    this.batchSize = batchSize;
+  }
+
+  @Override
+  public void putObject(int rowId, Object value) {
+    if (value == null) {
+      putNull(rowId);
+    } else {
+      getChildrenVector().putObject(rowId, value);
+    }
+  }
+
+  public void putArrayObject() {
+    if (this.getType().getName() == "ARRAY") {
+      childBlock = ((ArrayStreamReader) getChildrenVector()).buildBlock();
+    } else if (this.getType().getName() == "STRING") {
+      childBlock = ((SliceStreamReader) getChildrenVector()).buildBlock();
+    } else if (this.getType().getName() == "INT") {

Review comment:
       done




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