spark package 源码
spark package 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/package.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
import org.apache.spark.internal.Logging
/**
* A library for easily manipulating trees of operators. Operators that extend TreeNode are
* granted the following interface:
* <ul>
* <li>Scala collection like methods (foreach, map, flatMap, collect, etc)</li>
* <li>
* transform - accepts a partial function that is used to generate a new tree. When the
* partial function can be applied to a given tree segment, that segment is replaced with the
* result. After attempting to apply the partial function to a given node, the transform
* function recursively attempts to apply the function to that node's children.
* </li>
* <li>debugging support - pretty printing, easy splicing of trees, etc.</li>
* </ul>
*/
package object trees extends Logging {
// Since we want tree nodes to be lightweight, we create one logger for all treenode instances.
protected override def logName = "catalyst.trees"
/**
* A [[TreeNode]] companion for reference equality for Hash based Collection.
*/
class TreeNodeRef(val obj: TreeNode[_]) {
override def equals(o: Any): Boolean = o match {
case that: TreeNodeRef => that.obj.eq(obj)
case _ => false
}
override def hashCode: Int = if (obj == null) 0 else obj.hashCode
}
}
相关信息
相关文章
0
赞
- 所属分类： 前端技术
- 本文标签：
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦