Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19651#discussion_r152525693
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcSerializer.scala
---
@@ -0,0 +1,205 @@
+/*
+ * 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.io._
+import org.apache.orc.mapred.{OrcList, OrcMap, OrcStruct, OrcTimestamp}
+import org.apache.orc.storage.common.`type`.HiveDecimal
+import org.apache.orc.storage.serde2.io.{DateWritable, HiveDecimalWritable}
+
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.{SpecializedGetters,
SpecificInternalRow}
+import org.apache.spark.sql.catalyst.util._
+import
org.apache.spark.sql.execution.datasources.orc.OrcUtils.{getTypeDescription,
withNullSafe}
+import org.apache.spark.sql.types._
+import org.apache.spark.unsafe.types.UTF8String
+
+private[orc] class OrcSerializer(dataSchema: StructType) {
+
+ private[this] lazy val orcStruct: OrcStruct =
createOrcValue(dataSchema).asInstanceOf[OrcStruct]
+
+ private[this] lazy val length = dataSchema.length
+
+ private[this] val writers =
dataSchema.map(_.dataType).map(makeWriter).toArray
+
+ def serialize(row: InternalRow): OrcStruct = {
+ var i = 0
+ while (i < length) {
+ if (row.isNullAt(i)) {
+ orcStruct.setFieldValue(i, null)
+ } else {
+ writers(i)(row, i)
+ }
+ i += 1
+ }
+ orcStruct
+ }
+
+ private[this] def makeWriter(dataType: DataType): (SpecializedGetters,
Int) => Unit = {
+ dataType match {
+ case BooleanType =>
+ (row: SpecializedGetters, ordinal: Int) =>
+ orcStruct.setFieldValue(ordinal, new
BooleanWritable(row.getBoolean(ordinal)))
+
+ case ByteType =>
+ (row: SpecializedGetters, ordinal: Int) =>
+ orcStruct.setFieldValue(ordinal, new
ByteWritable(row.getByte(ordinal)))
+
+ case ShortType =>
+ (row: SpecializedGetters, ordinal: Int) =>
+ orcStruct.setFieldValue(ordinal, new
ShortWritable(row.getShort(ordinal)))
+
+ case IntegerType =>
+ (row: SpecializedGetters, ordinal: Int) =>
+ orcStruct.setFieldValue(ordinal, new
IntWritable(row.getInt(ordinal)))
+
+ case LongType =>
+ (row: SpecializedGetters, ordinal: Int) =>
+ orcStruct.setFieldValue(ordinal, new
LongWritable(row.getLong(ordinal)))
+
+ case FloatType =>
+ (row: SpecializedGetters, ordinal: Int) =>
+ orcStruct.setFieldValue(ordinal, new
FloatWritable(row.getFloat(ordinal)))
+
+ case DoubleType =>
+ (row: SpecializedGetters, ordinal: Int) =>
+ orcStruct.setFieldValue(ordinal, new
DoubleWritable(row.getDouble(ordinal)))
+
+ case _ =>
+ val wrapper = getWritableWrapper(dataType)
+ (row: SpecializedGetters, ordinal: Int) => {
+ val value = wrapper(row.get(ordinal,
dataType)).asInstanceOf[WritableComparable[_]]
+ orcStruct.setFieldValue(ordinal, value)
+ }
--- End diff --
the writer should be `(SpecializedGetters, Int, OrcValue) => Unit`
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