Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17924#discussion_r115646778
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcColumnarBatchReader.scala
---
@@ -0,0 +1,407 @@
+/*
+ * 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 org.apache.hadoop.mapreduce.{InputSplit, RecordReader,
TaskAttemptContext}
+import org.apache.hadoop.mapreduce.lib.input.FileSplit
+import org.apache.orc._
+import org.apache.orc.mapred.OrcInputFormat
+import org.apache.orc.storage.ql.exec.vector._
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.memory.MemoryMode
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.parser.CatalystSqlParser
+import org.apache.spark.sql.execution.vectorized.{ColumnarBatch,
ColumnVectorUtils}
+import org.apache.spark.sql.types._
+
+
+/**
+ * To support vectorization in WholeStageCodeGen, this reader returns
ColumnarBatch.
+ */
+private[orc] class OrcColumnarBatchReader extends RecordReader[Void,
ColumnarBatch] with Logging {
+ import OrcColumnarBatchReader._
+
+ /**
+ * ORC File Reader.
+ */
+ private var reader: Reader = _
+
+ /**
+ * ORC Data Schema.
+ */
+ private var schema: TypeDescription = _
+
+ /**
+ * Vectorized Row Batch.
+ */
+ private var batch: VectorizedRowBatch = _
+
+ /**
+ * Record reader from row batch.
+ */
+ private var rows: org.apache.orc.RecordReader = _
+
+ /**
+ * Spark Schema.
+ */
+ private var sparkSchema: StructType = _
+
+ /**
+ * Required Schema.
+ */
+ private var requiredSchema: StructType = _
+
+ /**
+ * Partition Column.
+ */
+ private var partitionColumns: StructType = _
+
+ private var useIndex: Boolean = false
+
+ /**
+ * Full Schema: requiredSchema + partition schema.
+ */
+ private var fullSchema: StructType = _
+
+ /**
+ * ColumnarBatch for vectorized execution by whole-stage codegen.
+ */
+ private var columnarBatch: ColumnarBatch = _
--- End diff --
More specially, we wrap Hive's `ColumnVector` to expose spark
`ColumnVector` for constructing Spark `ColumnarBatch`. So we don't need to move
data from one vector format to another vector format.
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