/**
* 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 com.huawei.streaming.api.opereators;
import com.thoughtworks.xstream.annotations.XStreamAlias;
/**
* 功能性算子，主要为系统提供window，join，orderby，group by等聚合操作。
*
* 这里的名称和operator包中的不一样
* 这里定义的这些operator，主要是进行执行计划的序列化和反序列化的。
* 所有的数据类型全部是字符串类型，
* 之后还要经过语法的解析，物理执行计划的优化之后，才会在application中提交。
*
*/
@XStreamAlias("Function")
public class InnerFunctionOperator extends Operator
{
/**
* 输出的列定义，
* 不光有单纯的列，还有udf以及udaf函数
*/
private String outputExpression;
/**
* <默认构造函数>
*/
public InnerFunctionOperator(String id, int parallelNumber)
{
super(id, parallelNumber);
}
public String getOutputExpression()
{
return outputExpression;
}
public void setOutputExpression(String outputExpression)
{
this.outputExpression = outputExpression;
}
}