rdblue commented on a change in pull request #29339:
URL: https://github.com/apache/spark/pull/29339#discussion_r464546037



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/AlterTableAddPartitionExec.scala
##########
@@ -0,0 +1,61 @@
+/*
+ * 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.execution.datasources.v2
+
+import org.apache.spark.sql.AnalysisException
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.catalog.CatalogTypes.TablePartitionSpec
+import org.apache.spark.sql.catalyst.expressions.Attribute
+import org.apache.spark.sql.connector.catalog.{CatalogV2Implicits, Identifier, 
TableCatalog}
+
+/**
+ * Physical plan node for adding partitions of table.
+ */
+case class AlterTableAddPartitionExec(
+    catalog: TableCatalog,
+    ident: Identifier,

Review comment:
       Why not pass a `Table` instance like other plans that modify table data 
(e.g., `AppendDataExec`)?
   
   We generally like to load tables early, so that we can do as much validation 
as possible in the analyzer and planner. By loading the table before passing it 
here, we would be able to use analyzer rules to validate the partition specs 
against the table's partition schema, and to make sure the table implements 
`SupportsPartitions`.




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