mchades commented on code in PR #9551: URL: https://github.com/apache/gravitino/pull/9551#discussion_r2659600878
########## api/src/main/java/org/apache/gravitino/function/Function.java: ########## @@ -0,0 +1,89 @@ +/* + * 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.gravitino.function; + +import javax.annotation.Nullable; +import org.apache.gravitino.Auditable; +import org.apache.gravitino.annotation.Evolving; +import org.apache.gravitino.rel.types.Type; + +/** Represents a user-defined function registered in Gravitino. */ +@Evolving +public interface Function extends Auditable { + /** An empty array of {@link FunctionColumn}. */ + FunctionColumn[] EMPTY = new FunctionColumn[0]; + + /** + * @return The function name. + */ + String name(); + + /** + * @return The function type. + */ + FunctionType functionType(); + + /** + * @return Whether the function is deterministic. + */ + boolean deterministic(); + + /** + * @return The optional comment of the function. + */ + @Nullable + default String comment() { + return null; + } + + /** + * The return type for scalar or aggregate functions. + * + * @return The return type, null if this is a table-valued function. + */ + @Nullable + default Type returnType() { + return null; + } + + /** + * The output columns for a table-valued function. + * + * @return The output columns of a table-valued function, or an empty array for scalar or + * aggregate functions. + */ + default FunctionColumn[] returnColumns() { + return EMPTY; + } + + /** + * @return The definitions of the function. + */ + FunctionDefinition[] definitions(); + + /** + * Returns the internal revision version of the function. + * + * <p>This version is a 0-based counter, where {@code 0} represents the initial definition of the + * function, and the value is incremented by 1 on each later alteration. + * + * @return The 0-based revision version of the function. + */ + int version(); Review Comment: Yes, in my design. -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
