Github user 10110346 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17698#discussion_r112392046
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
 ---
    @@ -1036,3 +1036,8 @@ case class UpCast(child: Expression, dataType: 
DataType, walkedTypePath: Seq[Str
       extends UnaryExpression with Unevaluable {
       override lazy val resolved = false
     }
    +
    +@ExpressionDescription(
    +  usage = "_FUNC_(expr) - Casts the value `expr` to the target data type 
`_FUNC_`.")
    +class CastAlias(child: Expression, dataType: DataType, timeZoneId: 
Option[String] = None)
    --- End diff --
    
    No,it will not


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