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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