imback82 commented on a change in pull request #26411: 
[SPARK-29772][TESTS][SQL] Add withNamespace in SQLTestUtils
URL: https://github.com/apache/spark/pull/26411#discussion_r343784310
 
 

 ##########
 File path: sql/core/src/test/scala/org/apache/spark/sql/test/SQLTestUtils.scala
 ##########
 @@ -363,6 +363,18 @@ private[sql] trait SQLTestUtilsBase
     }
   }
 
+  /**
+   * Drops namespace `namespace` after calling `f`.
+   */
+  protected def withNamespace(namespaces: String*)(f: => Unit): Unit = {
+    Utils.tryWithSafeFinally(f) {
+      namespaces.foreach { name =>
+        spark.sql(s"DROP NAMESPACE IF EXISTS $name CASCADE")
+      }
+      spark.sql(s"USE default")
 
 Review comment:
   > We should set back to the default namespace of the current catalog. Not 
sure we have such a command yet, cc @imback82
   
   No, we don't have a such a command yet. Do you think it will be useful to 
have one?
   
   This also reminds me about the behavior of dropping namespace. If you are 
trying to drop a namespace, which is set to the current namespace, this 
shouldn't be allowed right? We don't have a such a check yet, but I can add one 
if needed.

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