lirui-apache commented on a change in pull request #10296: [FLINK-14691][table]Add use/create/drop/alter database operation and support it in flink/blink planner URL: https://github.com/apache/flink/pull/10296#discussion_r350168963
########## File path: flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/operations/ddl/AlterOperation.java ########## @@ -0,0 +1,34 @@ +/* + * 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.flink.table.operations.ddl; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.table.operations.Operation; + +/** + * A {@link Operation} that describes the DDL statements, e.g. ALTER TABLE or ALTER DATABASE. + * + * <p>Different sub operations can have their special instances. For example, a + * alter table operation will have a {@link org.apache.flink.table.catalog.CatalogTable} instance, + * while a alter database operation will have a + * {@link org.apache.flink.table.catalog.CatalogDatabase} instance. Review comment: It seems to me this is just a marker interface, whether/what instance is used should be up to implementing classes. ---------------------------------------------------------------- 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] With regards, Apache Git Services
