Indhumathi27 commented on a change in pull request #3773:
URL: https://github.com/apache/carbondata/pull/3773#discussion_r433080176



##########
File path: 
core/src/main/java/org/apache/carbondata/core/datastore/page/encoding/adaptive/AdaptiveFloatingCodec.java
##########
@@ -247,6 +247,25 @@ public void decodeAndFillVector(byte[] pageData, 
ColumnVectorInfo vectorInfo, Bi
       DataType vectorDataType = vector.getType();
       vector = ColumnarVectorWrapperDirectFactory
           .getDirectVectorWrapperFactory(vector, null, nullBits, deletedRows, 
true, false);
+      CarbonColumnVector vectorColumn = null, childrenVectorInfo = null;
+      vectorColumn = vectorInfo.vector.getColumnVector();
+      if (vectorColumn != null) childrenVectorInfo = 
vectorColumn.getChildrenVector();

Review comment:
       Enclose if statement in braces

##########
File path: 
core/src/main/java/org/apache/carbondata/core/datastore/page/encoding/adaptive/AdaptiveIntegralCodec.java
##########
@@ -308,15 +308,49 @@ public void decodeAndFillVector(byte[] pageData, 
ColumnVectorInfo vectorInfo, Bi
     private void fillVector(byte[] pageData, CarbonColumnVector vector, 
DataType vectorDataType,
         DataType pageDataType, int pageSize, ColumnVectorInfo vectorInfo, 
BitSet nullBits) {
       int rowId = 0;
+      CarbonColumnVector vectorColumn = null, childrenVectorInfo = null;
+      vectorColumn = vectorInfo.vector.getColumnVector();
+      if (vectorColumn != null) childrenVectorInfo = 
vectorColumn.getChildrenVector();

Review comment:
       Same code is added in AdaptiveFloatingCodec. Extract common code to a 
method and reuse

##########
File path: 
integration/presto/src/main/prestosql/org/apache/carbondata/presto/readers/ArrayStreamReader.java
##########
@@ -0,0 +1,113 @@
+/*
+ * 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.scan.result.vector.impl.CarbonColumnVectorImpl;
+
+import io.prestosql.spi.block.Block;
+import io.prestosql.spi.block.BlockBuilder;
+
+/**
+ * Class to read the Array Stream
+ */
+
+public class ArrayStreamReader extends CarbonColumnVectorImpl implements 
PrestoVectorBlockBuilder {
+
+  protected int batchSize;
+  protected Type type;
+  Block childBlock = null;
+  protected BlockBuilder builder;
+
+  public ArrayStreamReader(int batchSize, DataType dataType) {
+    super(batchSize, dataType);
+    this.batchSize = batchSize;
+    if(dataType == DataTypes.STRING)

Review comment:
       enclose statements in braces

##########
File path: 
core/src/main/java/org/apache/carbondata/core/scan/executor/impl/AbstractQueryExecutor.java
##########
@@ -508,7 +508,7 @@ private BlockExecutionInfo 
getBlockExecutionInfoForBlock(QueryModel queryModel,
     int[] dimensionChunkIndexes = 
QueryUtil.getDimensionChunkIndexes(projectDimensions,
         segmentProperties.getDimensionOrdinalToChunkMapping(),
         currentBlockFilterDimensions, allProjectionListDimensionIdexes);
-    ReusableDataBuffer[] dimensionBuffer = new 
ReusableDataBuffer[projectDimensions.size()];
+    ReusableDataBuffer[] dimensionBuffer = new 
ReusableDataBuffer[projectDimensions.size() * 2];

Review comment:
       why this change?

##########
File path: 
core/src/main/java/org/apache/carbondata/core/datastore/page/encoding/adaptive/AdaptiveFloatingCodec.java
##########
@@ -51,8 +51,8 @@
  */
 public class AdaptiveFloatingCodec extends AdaptiveCodec {
 
-  private double factor;
   private float floatFactor;
+  private double factor;

Review comment:
       Please revert this change

##########
File path: 
core/src/main/java/org/apache/carbondata/core/scan/collector/impl/DictionaryBasedVectorResultCollector.java
##########
@@ -98,6 +98,14 @@ void prepareDimensionAndMeasureColumnVectors() {
         columnVectorInfo.dimension = queryDimensions[i];
         columnVectorInfo.ordinal = 
queryDimensions[i].getDimension().getOrdinal();
         allColumnInfo[queryDimensions[i].getOrdinal()] = columnVectorInfo;
+      } else if (queryDimensions[i].getDimension().isComplex()) {
+        ColumnVectorInfo columnVectorInfo = new ColumnVectorInfo();
+        complexList.add(columnVectorInfo);
+        columnVectorInfo.dimension = queryDimensions[i];
+        columnVectorInfo.ordinal = 
queryDimensions[i].getDimension().getOrdinal();
+        columnVectorInfo.genericQueryType =
+            
executionInfo.getComlexDimensionInfoMap().get(columnVectorInfo.ordinal);
+        allColumnInfo[queryDimensions[i].getOrdinal()] = columnVectorInfo;

Review comment:
       Remove ` else if (queryDimensions[i].getDimension().getDataType() != 
DataTypes.DATE) {` block and revert this change

##########
File path: 
integration/presto/src/main/prestosql/org/apache/carbondata/presto/readers/ArrayStreamReader.java
##########
@@ -0,0 +1,113 @@
+/*
+ * 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.scan.result.vector.impl.CarbonColumnVectorImpl;
+
+import io.prestosql.spi.block.Block;
+import io.prestosql.spi.block.BlockBuilder;
+
+/**
+ * Class to read the Array Stream
+ */
+
+public class ArrayStreamReader extends CarbonColumnVectorImpl implements 
PrestoVectorBlockBuilder {
+
+  protected int batchSize;
+  protected Type type;
+  Block childBlock = null;
+  protected BlockBuilder builder;
+
+  public ArrayStreamReader(int batchSize, DataType dataType) {
+    super(batchSize, dataType);
+    this.batchSize = batchSize;
+    if(dataType == DataTypes.STRING)
+        this.type =  new ArrayType(VarcharType.VARCHAR);
+    else if(dataType == DataTypes.INT)
+        this.type = new ArrayType(IntegerType.INTEGER);
+    else if(dataType == DataTypes.LONG)
+        this.type = new ArrayType(BigintType.BIGINT);

Review comment:
       why you assign BigInt type for Long?




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