Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/19943#discussion_r160078014
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/orc/JavaOrcColumnarBatchReader.java
---
@@ -0,0 +1,503 @@
+/*
+ * 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.spark.sql.execution.datasources.orc;
+
+import java.io.IOException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.mapreduce.InputSplit;
+import org.apache.hadoop.mapreduce.RecordReader;
+import org.apache.hadoop.mapreduce.TaskAttemptContext;
+import org.apache.hadoop.mapreduce.lib.input.FileSplit;
+import org.apache.orc.OrcConf;
+import org.apache.orc.OrcFile;
+import org.apache.orc.Reader;
+import org.apache.orc.TypeDescription;
+import org.apache.orc.mapred.OrcInputFormat;
+import org.apache.orc.storage.common.type.HiveDecimal;
+import org.apache.orc.storage.ql.exec.vector.*;
+import org.apache.orc.storage.serde2.io.HiveDecimalWritable;
+
+import org.apache.spark.memory.MemoryMode;
+import org.apache.spark.sql.catalyst.InternalRow;
+import org.apache.spark.sql.execution.vectorized.ColumnVectorUtils;
+import org.apache.spark.sql.execution.vectorized.OffHeapColumnVector;
+import org.apache.spark.sql.execution.vectorized.OnHeapColumnVector;
+import org.apache.spark.sql.execution.vectorized.WritableColumnVector;
+import org.apache.spark.sql.types.*;
+import org.apache.spark.sql.vectorized.ColumnarBatch;
+
+
+/**
+ * To support vectorization in WholeStageCodeGen, this reader returns
ColumnarBatch.
+ * After creating, `initialize` and `setRequiredSchema` should be called
sequentially.
+ */
+public class JavaOrcColumnarBatchReader extends RecordReader<Void,
ColumnarBatch> {
+
+ /**
+ * ORC File Reader.
+ */
+ private Reader reader;
+
+ /**
+ * Vectorized Row Batch.
+ */
+ private VectorizedRowBatch batch;
+
+ /**
+ * Requested Column IDs.
+ */
+ private int[] requestedColIds;
+
+ /**
+ * Record reader from row batch.
+ */
+ private org.apache.orc.RecordReader recordReader;
+
+ /**
+ * Required Schema.
+ */
+ private StructType requiredSchema;
+
+ /**
+ * ColumnarBatch for vectorized execution by whole-stage codegen.
+ */
+ private ColumnarBatch columnarBatch;
+
+ /**
+ * Writable column vectors of ColumnarBatch.
--- End diff --
Done.
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