Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/17698#discussion_r112383091
--- 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 --
will this work with our pattern matches in the query optimizer?
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