spark Transform 源码
spark Transform 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/Transform.java
/*
* 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.connector.expressions;
import org.apache.spark.annotation.Evolving;
/**
* Represents a transform function in the public logical expression API.
* <p>
* For example, the transform date(ts) is used to derive a date value from a timestamp column. The
* transform name is "date" and its argument is a reference to the "ts" column.
*
* @since 3.0.0
*/
@Evolving
public interface Transform extends Expression {
/**
* Returns the transform function name.
*/
String name();
/**
* Returns the arguments passed to the transform function.
*/
Expression[] arguments();
@Override
default Expression[] children() { return arguments(); }
}
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