nihal0107 commented on a change in pull request #3819:
URL: https://github.com/apache/carbondata/pull/3819#discussion_r450844071



##########
File path: 
sdk/sdk/src/main/java/org/apache/carbondata/sdk/file/ORCCarbonWriter.java
##########
@@ -0,0 +1,196 @@
+/*
+ * 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.sdk.file;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.*;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hive.ql.io.orc.OrcFile;
+import org.apache.hadoop.hive.ql.io.orc.OrcStruct;
+import org.apache.hadoop.hive.ql.io.orc.Reader;
+import org.apache.hadoop.hive.ql.io.orc.RecordReader;
+import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
+import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
+import org.apache.hadoop.io.Text;
+
+/**
+ * Implementation to write ORC rows in CSV format to carbondata file.
+ */
+public class ORCCarbonWriter extends CSVCarbonWriter {
+  private CSVCarbonWriter csvCarbonWriter = null;
+  private String filePath = "";
+  private Reader orcReader = null;
+  private boolean isDirectory = false;
+  private List<String> fileList;
+
+  ORCCarbonWriter(CSVCarbonWriter csvCarbonWriter) {
+    this.csvCarbonWriter = csvCarbonWriter;
+  }
+
+  @Override
+  public void setFilePath(String filePath) {
+    this.filePath = filePath;
+  }
+
+  @Override
+  public void setIsDirectory(boolean isDirectory) {
+    this.isDirectory = isDirectory;
+  }
+
+  @Override
+  public void setFileList(List<String> fileList) {
+    this.fileList = fileList;
+  }
+
+  /**
+   * Load ORC file in iterative way.
+   */
+  @Override
+  public void write() throws IOException {
+    if (this.filePath.length() == 0) {
+      throw new RuntimeException("'withOrcPath()' must be called to support 
load ORC files");
+    }
+    if (this.csvCarbonWriter == null) {
+      throw new RuntimeException("csv carbon writer can not be null");
+    }
+    if (this.isDirectory) {
+      if (this.fileList == null || this.fileList.size() == 0) {
+        File[] dataFiles = new File(this.filePath).listFiles();
+        if (dataFiles == null || dataFiles.length == 0) {
+          throw new RuntimeException("No ORC file found at given location. 
Please provide " +
+              "the correct folder location.");
+        }
+        for (File dataFile : dataFiles) {
+          this.loadSingleFile(dataFile);
+        }
+      } else {
+        for (String file : this.fileList) {
+          this.loadSingleFile(new File(this.filePath + "/" + file));
+        }
+      }
+    } else {
+      this.loadSingleFile(new File(this.filePath));
+    }
+  }
+
+  private void loadSingleFile(File file) throws IOException {
+    orcReader = OrcFile.createReader(new Path(String.valueOf(file)),
+        OrcFile.readerOptions(new Configuration()));
+    ObjectInspector objectInspector = orcReader.getObjectInspector();
+    RecordReader recordReader = orcReader.rows();
+    if (objectInspector instanceof StructObjectInspector) {
+      StructObjectInspector structObjectInspector =
+          (StructObjectInspector) orcReader.getObjectInspector();
+      while (recordReader.hasNext()) {
+        Object record = recordReader.next(null); // to remove duplicacy.
+        List valueList = 
structObjectInspector.getStructFieldsDataAsList(record);
+        for (int i = 0; i < valueList.size(); i++) {
+          valueList.set(i, parseOrcObject(valueList.get(i), 0));
+        }
+        this.csvCarbonWriter.write(valueList.toArray());
+      }
+    } else {
+      while (recordReader.hasNext()) {
+        Object record = recordReader.next(null); // to remove duplicacy.
+        this.csvCarbonWriter.write(new Object[]{parseOrcObject(record, 0)});
+      }
+    }
+  }
+
+  private String parseOrcObject(Object obj, int level) {
+    if (obj instanceof OrcStruct) {
+      Objects.requireNonNull(orcReader);
+      StructObjectInspector structObjectInspector = (StructObjectInspector) 
orcReader
+          .getObjectInspector();
+      List value = structObjectInspector.getStructFieldsDataAsList(obj);
+      for (int i = 0; i < value.size(); i++) {
+        value.set(i, parseOrcObject(value.get(i), level + 1));
+      }
+      String str = listToString(value, level);
+      if (str.length() > 0) {
+        return str.substring(0, str.length() - 1);
+      }
+      return null;
+    } else if (obj instanceof ArrayList) {
+      ArrayList listValue = (ArrayList) obj;
+      for (int i = 0; i < listValue.size(); i++) {
+        listValue.set(i, parseOrcObject(listValue.get(i), level + 1));
+      }
+      String str = listToString(listValue, level);
+      if (str.length() > 0) {
+        return str.substring(0, str.length() - 1);
+      }
+      return null;
+    } else if (obj instanceof LinkedHashMap) {
+      LinkedHashMap<Text, Object> keyValueRow = (LinkedHashMap<Text, Object>) 
obj;
+      for (Map.Entry<Text, Object> entry : keyValueRow.entrySet()) {
+        Object val = parseOrcObject(keyValueRow.get(entry.getKey()), level + 
2);
+        keyValueRow.put(entry.getKey(), val);
+      }
+      StringBuilder str = new StringBuilder();
+      for (Map.Entry<Text, Object> entry : keyValueRow.entrySet()) {
+        Text key = entry.getKey();
+        
str.append(key.toString()).append("$").append(keyValueRow.get(key)).append("#");
+      }
+      if (str.length() > 0) {
+        return str.substring(0, str.length() - 1);
+      }
+      return null;
+    }
+    if (obj == null) {
+      return null;
+    }
+    return obj.toString();
+  }
+
+  private String listToString(List value, int level) {
+    String delimeter = "";

Review comment:
       done




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