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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.command
import org.apache.spark.sql.{AnalysisException, Row, SQLContext}
import org.apache.spark.sql.catalyst.FunctionIdentifier
import org.apache.spark.sql.catalyst.catalog.CatalogFunction
import org.apache.spark.sql.catalyst.expressions.ExpressionInfo
/**
* The DDL command that creates a function.
* To create a temporary function, the syntax of using this command in SQL is:
* {{{
* CREATE TEMPORARY FUNCTION functionName
* AS className [USING JAR\FILE 'uri' [, JAR|FILE 'uri']]
* }}}
*
* To create a permanent function, the syntax in SQL is:
* {{{
* CREATE FUNCTION [databaseName.]functionName
* AS className [USING JAR\FILE 'uri' [, JAR|FILE 'uri']]
* }}}
*/
// TODO: Use Seq[FunctionResource] instead of Seq[(String, String)] for resources.
case class CreateFunction(
databaseName: Option[String],
functionName: String,
className: String,
resources: Seq[(String, String)],
isTemp: Boolean)
extends RunnableCommand {
override def run(sqlContext: SQLContext): Seq[Row] = {
val catalog = sqlContext.sessionState.catalog
if (isTemp) {
if (databaseName.isDefined) {
throw new AnalysisException(
s"It is not allowed to provide database name when defining a temporary function. " +
s"However, database name ${databaseName.get} is provided.")
}
// We first load resources and then put the builder in the function registry.
// Please note that it is allowed to overwrite an existing temp function.
catalog.loadFunctionResources(resources)
val info = new ExpressionInfo(className, functionName)
val builder = catalog.makeFunctionBuilder(functionName, className)
catalog.createTempFunction(functionName, info, builder, ignoreIfExists = false)
} else {
// For a permanent, we will store the metadata into underlying external catalog.
// This function will be loaded into the FunctionRegistry when a query uses it.
// We do not load it into FunctionRegistry right now.
// TODO: should we also parse "IF NOT EXISTS"?
catalog.createFunction(
CatalogFunction(FunctionIdentifier(functionName, databaseName), className, resources),
ignoreIfExists = false)
}
Seq.empty[Row]
}
}
/**
* The DDL command that drops a function.
* ifExists: returns an error if the function doesn't exist, unless this is true.
* isTemp: indicates if it is a temporary function.
*/
case class DropFunction(
databaseName: Option[String],
functionName: String,
ifExists: Boolean,
isTemp: Boolean)
extends RunnableCommand {
override def run(sqlContext: SQLContext): Seq[Row] = {
val catalog = sqlContext.sessionState.catalog
if (isTemp) {
if (databaseName.isDefined) {
throw new AnalysisException(
s"It is not allowed to provide database name when dropping a temporary function. " +
s"However, database name ${databaseName.get} is provided.")
}
catalog.dropTempFunction(functionName, ifExists)
} else {
// We are dropping a permanent function.
catalog.dropFunction(
FunctionIdentifier(functionName, databaseName),
ignoreIfNotExists = ifExists)
}
Seq.empty[Row]
}
}
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