Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17655#discussion_r112146073
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/test/SQLTestUtils.scala ---
    @@ -229,6 +229,32 @@ private[sql] trait SQLTestUtils
       }
     
       /**
    +   * Drops database `dbName` after calling `f`.
    +   */
    +  protected def withDatabase(dbNames: String*)(f: => Unit): Unit = {
    --- End diff --
    
    I'm fine with this but there's only one usage of it, and other tests don't 
seem to bother to drop their tables -- is it necessary within the context of 
one run? or just inline this? I don't feel strongly, you can leave it too.


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