Github user cloud-fan commented on a diff in the pull request:
    --- Diff: 
    @@ -821,9 +821,12 @@ object TypeCoercion {
         private def createBoundaryCast(boundary: Expression, dt: DataType): 
Expression = {
    -      boundary match {
    -        case e: SpecialFrameBoundary => e
    -        case e: Expression if e.dataType != dt && Cast.canCast(e.dataType, 
dt) => Cast(e, dt)
    +      (boundary, dt) match {
    +        case (e: SpecialFrameBoundary, _) => e
    +        case (e: Expression, _: DateType) => e
    --- End diff --
    nit: just `e` instead of `e: Expression`

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