org.apache.spark.sql.catalyst.plans.logical.ScriptTransformation.scala Maven / Gradle / Ivy
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.sql.catalyst.plans.logical
import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeSet, Expression}
/**
* 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.
* @param ioschema the input and output schema applied in the execution of the script.
*/
case class ScriptTransformation(
input: Seq[Expression],
script: String,
output: Seq[Attribute],
child: LogicalPlan,
ioschema: ScriptInputOutputSchema) extends UnaryNode {
override def references: AttributeSet = AttributeSet(input.flatMap(_.references))
}
/**
* Input and output properties when passing data to a script.
* For example, in Hive this would specify which SerDes to use.
*/
case class ScriptInputOutputSchema(
inputRowFormat: Seq[(String, String)],
outputRowFormat: Seq[(String, String)],
inputSerdeClass: Option[String],
outputSerdeClass: Option[String],
inputSerdeProps: Seq[(String, String)],
outputSerdeProps: Seq[(String, String)],
recordReaderClass: Option[String],
recordWriterClass: Option[String],
schemaLess: Boolean) {
def inputRowFormatSQL: Option[String] =
getRowFormatSQL(inputRowFormat, inputSerdeClass, inputSerdeProps)
def outputRowFormatSQL: Option[String] =
getRowFormatSQL(outputRowFormat, outputSerdeClass, outputSerdeProps)
/**
* Get the row format specification
* Note:
* 1. Changes are needed when readerClause and writerClause are supported.
* 2. Changes are needed when "ESCAPED BY" is supported.
*/
private def getRowFormatSQL(
rowFormat: Seq[(String, String)],
serdeClass: Option[String],
serdeProps: Seq[(String, String)]): Option[String] = {
if (schemaLess) return Some("")
val rowFormatDelimited =
rowFormat.map {
case ("TOK_TABLEROWFORMATFIELD", value) =>
"FIELDS TERMINATED BY " + value
case ("TOK_TABLEROWFORMATCOLLITEMS", value) =>
"COLLECTION ITEMS TERMINATED BY " + value
case ("TOK_TABLEROWFORMATMAPKEYS", value) =>
"MAP KEYS TERMINATED BY " + value
case ("TOK_TABLEROWFORMATLINES", value) =>
"LINES TERMINATED BY " + value
case ("TOK_TABLEROWFORMATNULL", value) =>
"NULL DEFINED AS " + value
case o => return None
}
val serdeClassSQL = serdeClass.map("'" + _ + "'").getOrElse("")
val serdePropsSQL =
if (serdeClass.nonEmpty) {
val props = serdeProps.map{p => s"'${p._1}' = '${p._2}'"}.mkString(", ")
if (props.nonEmpty) " WITH SERDEPROPERTIES(" + props + ")" else ""
} else {
""
}
if (rowFormat.nonEmpty) {
Some("ROW FORMAT DELIMITED " + rowFormatDelimited.mkString(" "))
} else {
Some("ROW FORMAT SERDE " + serdeClassSQL + serdePropsSQL)
}
}
}