rdblue commented on a change in pull request #31575:
URL: https://github.com/apache/spark/pull/31575#discussion_r577771433



##########
File path: 
sql/core/src/test/scala/org/apache/spark/sql/execution/command/v1/AlterTableRenameSuite.scala
##########
@@ -0,0 +1,112 @@
+/*
+ * 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.command.v1
+
+import org.apache.spark.sql.{AnalysisException, Row}
+import org.apache.spark.sql.execution.command
+
+/**
+ * This base suite contains unified tests for the `ALTER TABLE .. RENAME` 
command that check V1
+ * table catalogs. The tests that cannot run for all V1 catalogs are located 
in more
+ * specific test suites:
+ *
+ *   - V1 In-Memory catalog: 
`org.apache.spark.sql.execution.command.v1.AlterTableRenameSuite`
+ *   - V1 Hive External catalog: 
`org.apache.spark.sql.hive.execution.command.AlterTableRenameSuite`
+ */
+trait AlterTableRenameSuiteBase extends command.AlterTableRenameSuiteBase {
+  test("omit namespace in the destination table") {
+    withNamespaceAndTable("ns", "dst_tbl") { dst =>
+      val src = dst.replace("dst", "src")
+      sql(s"CREATE TABLE $src (c0 INT) $defaultUsing")
+      sql(s"INSERT INTO $src SELECT 0")
+
+      sql(s"ALTER TABLE $src RENAME TO dst_tbl")

Review comment:
       > we can simply update the API doc of TableCatalog.renameTable and say: 
if the newIdent has no namespace, it means the namespace of oldIdent
   
   -1 for this idea. I think this is a mistake.
   
   This would introduce ambiguity in the API that requires the implementer to 
know how to do something correctly. In DSv2, we avoid those cases by making 
Spark a little smarter so that we have uniform behavior across sources. Instead 
of adding documentation, Spark should always pass the correct identifier for 
the rename.




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