spark AgeExample 源码
spark AgeExample 代码
文件路径：/examples/src/main/scala/org/apache/spark/examples/extensions/AgeExample.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.examples.extensions
import org.apache.spark.sql.catalyst.expressions.{CurrentDate, Expression, RuntimeReplaceable, SubtractDates}
import org.apache.spark.sql.catalyst.trees.UnaryLike
/**
* How old are you in days?
*/
case class AgeExample(birthday: Expression) extends RuntimeReplaceable with UnaryLike[Expression] {
override lazy val replacement: Expression = SubtractDates(CurrentDate(), birthday)
override def child: Expression = birthday
override protected def withNewChildInternal(newChild: Expression): Expression = {
copy(birthday = newChild)
}
}
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