Github user tigerquoll commented on a diff in the pull request: https://github.com/apache/spark/pull/21306#discussion_r214806854 --- Diff: sql/catalyst/src/main/java/org/apache/spark/sql/catalog/v2/TableChange.java --- @@ -0,0 +1,182 @@ +/* + * 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.catalog.v2; + +import org.apache.spark.sql.types.DataType; + +/** + * TableChange subclasses represent requested changes to a table. These are passed to + * {@link TableCatalog#alterTable}. For example, + * <pre> + * import TableChange._ + * val catalog = source.asInstanceOf[TableSupport].catalog() + * catalog.alterTable(ident, + * addColumn("x", IntegerType), + * renameColumn("a", "b"), + * deleteColumn("c") + * ) + * </pre> + */ +public interface TableChange { --- End diff -- Can we support adding a comment to a column? / table?
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