Github user mgaido91 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19883#discussion_r155221911
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
 ---
    @@ -444,11 +444,11 @@ case class DayOfWeek(child: Expression) extends 
UnaryExpression with ImplicitCas
           val cal = classOf[Calendar].getName
           val c = ctx.freshName("cal")
           val dtu = DateTimeUtils.getClass.getName.stripSuffix("$")
    -      ctx.addMutableState(cal, c, s"""$c = 
$cal.getInstance($dtu.getTimeZone("UTC"));""")
    --- End diff --
    
    but this is done every time, since we are crating a new one for each 
expression


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