spark Rule 源码
spark Rule 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/rules/Rule.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.catalyst.rules
import org.apache.spark.internal.Logging
import org.apache.spark.sql.catalyst.SQLConfHelper
import org.apache.spark.sql.catalyst.trees.TreeNode
abstract class Rule[TreeType <: TreeNode[_]] extends SQLConfHelper with Logging {
// The integer id of a rule, for pruning unnecessary tree traversals.
protected lazy val ruleId = RuleIdCollection.getRuleId(this.ruleName)
/** Name for this rule, automatically inferred based on class name. */
val ruleName: String = {
val className = getClass.getName
if (className endsWith "$") className.dropRight(1) else className
}
def apply(plan: TreeType): TreeType
}
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