Github user heary-cao commented on a diff in the pull request:

    https://github.com/apache/spark/pull/23151#discussion_r237362372
  
    --- Diff: core/src/test/scala/org/apache/spark/SparkFunSuite.scala ---
    @@ -105,5 +105,16 @@ abstract class SparkFunSuite
           logInfo(s"\n\n===== FINISHED $shortSuiteName: '$testName' =====\n")
         }
       }
    -
    +  /**
    +   * Creates a temporary directory, which is then passed to `f` and will 
be deleted after `f`
    +   * returns.
    +   *
    +   * @todo Probably this method should be moved to a more general place
    +   */
    +  protected def withCreateTempDir(f: File => Unit): Unit = {
    --- End diff --
    
    Sorry, maybe I didn't make it clear.  `withTempDir ` define in 
`SQLTestUtilsBase` not in `SQLTestUtils `.if we will override  `withTempDir `  
first must be remove  `withTempDir ` from `SQLTestUtilsBase` to `SQLTestUtils` 
and override,  but in this way, other functions are also involved. 


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