rdblue commented on a change in pull request #24559: URL: https://github.com/apache/spark/pull/24559#discussion_r605229735
########## File path: sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/functions/UnboundFunction.java ########## @@ -0,0 +1,50 @@ +/* + * 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.sql.types.StructType; + +/** + * Represents a user-defined function that is not bound to input types. + */ +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. Review comment: I think they're synonymous in this context. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
