Github user tigerquoll commented on a diff in the pull request:
https://github.com/apache/spark/pull/21306#discussion_r214808418
--- 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 --
is adding or dropping table partitions a table change?
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