spark ExperimentalMethods 源码
spark ExperimentalMethods 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/ExperimentalMethods.scala
/*
* 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
import org.apache.spark.annotation.{Experimental, Unstable}
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.catalyst.rules.Rule
/**
* :: Experimental ::
* Holder for experimental methods for the bravest. We make NO guarantee about the stability
* regarding binary compatibility and source compatibility of methods here.
*
* {{{
* spark.experimental.extraStrategies += ...
* }}}
*
* @since 1.3.0
*/
@Experimental
@Unstable
class ExperimentalMethods private[sql]() {
/**
* Allows extra strategies to be injected into the query planner at runtime. Note this API
* should be considered experimental and is not intended to be stable across releases.
*
* @since 1.3.0
*/
@volatile var extraStrategies: Seq[Strategy] = Nil
@volatile var extraOptimizations: Seq[Rule[LogicalPlan]] = Nil
override def clone(): ExperimentalMethods = {
val result = new ExperimentalMethods
result.extraStrategies = extraStrategies
result.extraOptimizations = extraOptimizations
result
}
}
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