Github user dongjoon-hyun commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18469#discussion_r124913758
  
    --- Diff: 
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/CatalystTestUtils.scala
 ---
    @@ -37,4 +40,32 @@ object DateTimeTestUtils {
           DateTimeUtils.resetThreadLocals()
         }
       }
    +
    +  /**
    +   * Sets all SQL configurations specified in `pairs`, calls `f`, and then 
restore all SQL
    +   * configurations.
    +   */
    +  protected def withSQLConf(pairs: (String, String)*)(f: => Unit): Unit = {
    --- End diff --
    
    Hi, @gatorsmile .
    Then, what about removing `withSQLConf` from `SQLTestUtils` instead of 
having duplicated logic?
    Since this is `trait`, I think we can do that in this PR, too.


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