Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14702#discussion_r76183051
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/script/ScriptTransformationExec.scala
---
@@ -0,0 +1,313 @@
+/*
+ * 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.script
+
+import java.io._
+import java.nio.charset.StandardCharsets
+
+import scala.collection.JavaConverters._
+import scala.util.control.NonFatal
+
+import org.apache.hadoop.conf.Configuration
+
+import org.apache.spark.{SparkException, TaskContext}
+import org.apache.spark.internal.Logging
+import org.apache.spark.rdd.RDD
+import org.apache.spark.sql.SQLContext
+import org.apache.spark.sql.catalyst.{CatalystTypeConverters, InternalRow}
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.plans.logical.ScriptInputOutputSchema
+import org.apache.spark.sql.execution.{SparkPlan, UnaryExecNode}
+import org.apache.spark.sql.types.{DataType, StructType}
+import org.apache.spark.util.{CircularBuffer, RedirectThread,
SerializableConfiguration, Utils}
+
+/**
+ * Transforms the input by forking and running the specified script.
+ *
+ * @param input the set of expression that should be passed to the script.
+ * @param script the command that should be executed.
+ * @param output the attributes that are produced by the script.
+ */
+private[sql]
+case class ScriptTransformationExec(
+ input: Seq[Expression],
+ script: String,
+ output: Seq[Attribute],
+ child: SparkPlan,
+ ioschema: ScriptTransformIOSchema)
+ extends UnaryExecNode with ScriptTransformBase {
+
+ override def producedAttributes: AttributeSet = outputSet -- inputSet
+
+ protected override def doExecute(): RDD[InternalRow] =
+ execute(sqlContext, child, schema)
+
+ override def processIterator(
+ inputIterator: Iterator[InternalRow],
+ hadoopConf: Configuration) : Iterator[InternalRow] = {
+
+ val (proc, inputStream, outputStream, stderrBuffer, outputProjection) =
+ init(input, script, child)
+
+ // This new thread will consume the ScriptTransformation's input rows
and write them to the
+ // external process. That process's output will be read by this
current thread.
+ val writerThread = new ScriptTransformationWriterThread(
+ inputIterator,
+ input.map(_.dataType),
+ outputProjection,
+ ioschema,
+ outputStream,
+ proc,
+ stderrBuffer,
+ TaskContext.get(),
+ hadoopConf
+ )
+
+ val reader = createReader(inputStream)
+
+ val outputIterator: Iterator[InternalRow] = new Iterator[InternalRow] {
+ var curLine: String = null
+ val mutableRow = new SpecificMutableRow(output.map(_.dataType))
+
+ override def hasNext: Boolean = {
+ try {
+ if (curLine == null) {
+ curLine = reader.readLine()
+ if (curLine == null) {
+ checkFailureAndPropagate(writerThread.exception, null, proc,
stderrBuffer)
+ return false
+ }
+ }
+ true
+ } catch {
+ case NonFatal(e) =>
+ // If this exception is due to abrupt / unclean termination of
`proc`,
+ // then detect it and propagate a better exception message for
end users
+ checkFailureAndPropagate(writerThread.exception, e, proc,
stderrBuffer)
+
+ throw e
+ }
+ }
+
+ override def next(): InternalRow = {
+ if (!hasNext) {
+ throw new NoSuchElementException
+ }
+ val prevLine = curLine
+ curLine = reader.readLine()
+ if (!ioschema.isSchemaLess) {
+ new GenericInternalRow(
+
prevLine.split(ioschema.outputRowFormatMap("TOK_TABLEROWFORMATFIELD"))
+ .map(CatalystTypeConverters.convertToCatalyst))
+ } else {
+ new GenericInternalRow(
+
prevLine.split(ioschema.outputRowFormatMap("TOK_TABLEROWFORMATFIELD"), 2)
+ .map(CatalystTypeConverters.convertToCatalyst))
+ }
+ }
+ }
+
+ writerThread.start()
+ outputIterator
+ }
+}
+
+private[sql] trait ScriptTransformBase extends Serializable with Logging {
+
+ def init(input: Seq[Expression],
--- End diff --
can we fix the indent (using 4 space indent) for function parameters in
this file?
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