Github user mccheah commented on a diff in the pull request:
https://github.com/apache/spark/pull/21306#discussion_r230973235
--- 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 --
Would it be a valid operation to change the partitioning of the table
without dropping the entire table and re-creating it? E.g. change the bucket
size for such and such column. Seems pretty difficult to do in practice though
since the underlying data layout would have to change as part of the
modification.
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