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[GitHub] [carbondata] akkio-97 opened a new pull request #3773: [CARBONDATA-3830]Presto complex columns read support

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[GitHub] [carbondata] akkio-97 commented on a change in pull request #3773: [CARBONDATA-3830]Presto complex columns read support

akkio-97 commented on a change in pull request #3773:
URL: https://github.com/apache/carbondata/pull/3773#discussion_r462856119

##########
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()));

Review comment:
done

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