spark UnboundFunction 源码
spark UnboundFunction 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/functions/UnboundFunction.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.catalog.functions;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.types.StructType;
/**
* Represents a user-defined function that is not bound to input types.
*
* @since 3.2.0
*/
@Evolving
public interface UnboundFunction extends Function {
/**
* Bind this function to an input type.
* <p>
* If the input type is not supported, implementations must throw
* {@link UnsupportedOperationException}.
* <p>
* For example, a "length" function that only supports a single string argument should throw
* UnsupportedOperationException if the struct has more than one field or if that field is not a
* string, and it may optionally throw if the field is nullable.
*
* @param inputType a struct type for inputs that will be passed to the bound function
* @return a function that can process rows with the given input type
* @throws UnsupportedOperationException If the function cannot be applied to the input type
*/
BoundFunction bind(StructType inputType);
/**
* Returns Function documentation.
*
* @return this function's documentation
*/
String description();
}
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