1/* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18package org.apache.spark.sql 19 20import org.apache.spark.annotation.{Experimental, InterfaceStability} 21import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan 22import org.apache.spark.sql.catalyst.rules.Rule 23 24/** 25 * :: Experimental :: 26 * Holder for experimental methods for the bravest. We make NO guarantee about the stability 27 * regarding binary compatibility and source compatibility of methods here. 28 * 29 * {{{ 30 * spark.experimental.extraStrategies += ... 31 * }}} 32 * 33 * @since 1.3.0 34 */ 35@Experimental 36@InterfaceStability.Unstable 37class ExperimentalMethods private[sql]() { 38 39 /** 40 * Allows extra strategies to be injected into the query planner at runtime. Note this API 41 * should be considered experimental and is not intended to be stable across releases. 42 * 43 * @since 1.3.0 44 */ 45 @volatile var extraStrategies: Seq[Strategy] = Nil 46 47 @volatile var extraOptimizations: Seq[Rule[LogicalPlan]] = Nil 48 49} 50