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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,
* 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
import org.apache.spark.Logging
import org.apache.spark.annotation.DeveloperApi
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.catalyst.errors.TreeNodeException
import org.apache.spark.sql.catalyst.expressions.{Attribute, GenericRow}
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.{Row, SQLConf, SQLContext}
trait Command {
/**
* A concrete command should override this lazy field to wrap up any side effects caused by the
* command or any other computation that should be evaluated exactly once. The value of this field
* can be used as the contents of the corresponding RDD generated from the physical plan of this
* command.
*
* The `execute()` method of all the physical command classes should reference `sideEffectResult`
* so that the command can be executed eagerly right after the command query is created.
*/
protected[sql] lazy val sideEffectResult: Seq[Any] = Seq.empty[Any]
}
/**
* :: DeveloperApi ::
*/
@DeveloperApi
case class SetCommand(
key: Option[String], value: Option[String], output: Seq[Attribute])(
@transient context: SQLContext)
extends LeafNode with Command with Logging {
override protected[sql] lazy val sideEffectResult: Seq[String] = (key, value) match {
// Set value for key k.
case (Some(k), Some(v)) =>
if (k == SQLConf.Deprecated.MAPRED_REDUCE_TASKS) {
logWarning(s"Property ${SQLConf.Deprecated.MAPRED_REDUCE_TASKS} is deprecated, " +
s"automatically converted to ${SQLConf.SHUFFLE_PARTITIONS} instead.")
context.set(SQLConf.SHUFFLE_PARTITIONS, v)
Array(s"${SQLConf.SHUFFLE_PARTITIONS}=$v")
} else {
context.set(k, v)
Array(s"$k=$v")
}
// Query the value bound to key k.
case (Some(k), _) =>
// TODO (lian) This is just a workaround to make the Simba ODBC driver work.
// Should remove this once we get the ODBC driver updated.
if (k == "-v") {
val hiveJars = Seq(
"hive-exec-0.12.0.jar",
"hive-service-0.12.0.jar",
"hive-common-0.12.0.jar",
"hive-hwi-0.12.0.jar",
"hive-0.12.0.jar").mkString(":")
Array(
"system:java.class.path=" + hiveJars,
"system:sun.java.command=shark.SharkServer2")
}
else {
Array(s"$k=${context.getOption(k).getOrElse("<undefined>")}")
}
// Query all key-value pairs that are set in the SQLConf of the context.
case (None, None) =>
context.getAll.map { case (k, v) =>
s"$k=$v"
}
case _ =>
throw new IllegalArgumentException()
}
def execute(): RDD[Row] = {
val rows = sideEffectResult.map { line => new GenericRow(Array[Any](line)) }
context.sparkContext.parallelize(rows, 1)
}
override def otherCopyArgs = context :: Nil
}
/**
* An explain command for users to see how a command will be executed.
*
* Note that this command takes in a logical plan, runs the optimizer on the logical plan
* (but do NOT actually execute it).
*
* :: DeveloperApi ::
*/
@DeveloperApi
case class ExplainCommand(
logicalPlan: LogicalPlan, output: Seq[Attribute])(
@transient context: SQLContext)
extends LeafNode with Command {
// Run through the optimizer to generate the physical plan.
override protected[sql] lazy val sideEffectResult: Seq[String] = try {
"Physical execution plan:" +: context.executePlan(logicalPlan).executedPlan.toString.split("\n")
} catch { case cause: TreeNodeException[_] =>
"Error occurred during query planning: " +: cause.getMessage.split("\n")
}
def execute(): RDD[Row] = {
val explanation = sideEffectResult.map(row => new GenericRow(Array[Any](row)))
context.sparkContext.parallelize(explanation, 1)
}
override def otherCopyArgs = context :: Nil
}
/**
* :: DeveloperApi ::
*/
@DeveloperApi
case class CacheCommand(tableName: String, doCache: Boolean)(@transient context: SQLContext)
extends LeafNode with Command {
override protected[sql] lazy val sideEffectResult = {
if (doCache) {
context.cacheTable(tableName)
} else {
context.uncacheTable(tableName)
}
Seq.empty[Any]
}
override def execute(): RDD[Row] = {
sideEffectResult
context.emptyResult
}
override def output: Seq[Attribute] = Seq.empty
}
/**
* :: DeveloperApi ::
*/
@DeveloperApi
case class DescribeCommand(child: SparkPlan, output: Seq[Attribute])(
@transient context: SQLContext)
extends LeafNode with Command {
override protected[sql] lazy val sideEffectResult: Seq[(String, String, String)] = {
Seq(("# Registered as a temporary table", null, null)) ++
child.output.map(field => (field.name, field.dataType.toString, null))
}
override def execute(): RDD[Row] = {
val rows = sideEffectResult.map {
case (name, dataType, comment) => new GenericRow(Array[Any](name, dataType, comment))
}
context.sparkContext.parallelize(rows, 1)
}
}
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