VenuReddy2103 commented on a change in pull request #3819:
URL:
https://github.com/apache/carbondata/pull/3819#discussion_r478495670##########
File path: sdk/sdk/src/main/java/org/apache/carbondata/sdk/file/ORCCarbonWriter.java
##########
@@ -0,0 +1,173 @@
+/*
+ * 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.IOException;
+import java.util.*;
+
+import org.apache.carbondata.core.constants.CarbonCommonConstants;
+import org.apache.carbondata.core.datastore.filesystem.CarbonFile;
+import org.apache.carbondata.sdk.file.utils.SDKUtil;
+
+import org.apache.hadoop.conf.Configuration;
+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 Configuration configuration;
+ private CSVCarbonWriter csvCarbonWriter = null;
+ private Reader orcReader = null;
+ private CarbonFile[] dataFiles;
+
+ ORCCarbonWriter(CSVCarbonWriter csvCarbonWriter, Configuration configuration) {
+ this.csvCarbonWriter = csvCarbonWriter;
+ this.configuration = configuration;
+ }
+
+ @Override
+ public void setDataFiles(CarbonFile[] dataFiles) {
+ this.dataFiles = dataFiles;
+ }
+
+ /**
+ * Load ORC file in iterative way.
+ */
+ @Override
+ public void write() throws IOException {
+ if (this.dataFiles == null || this.dataFiles.length == 0) {
+ throw new RuntimeException("'withOrcPath()' must be called to support loading ORC files");
+ }
+ if (this.csvCarbonWriter == null) {
+ throw new RuntimeException("csv carbon writer can not be null");
+ }
+ Arrays.sort(this.dataFiles, Comparator.comparing(CarbonFile::getPath));
+ for (CarbonFile dataFile : this.dataFiles) {
+ this.loadSingleFile(dataFile);
+ }
+ }
+
+ private void loadSingleFile(CarbonFile file) throws IOException {
+ orcReader = SDKUtil.buildOrcReader(file.getPath(), this.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.
Review comment:
was looking at API documentation and references from internet. Info in the documentation is limited though. `recordReader.next()` takes previous record as arg. But we are always passing null ? Same applies to below else case too
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