Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/12893#discussion_r62140732
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -68,6 +68,25 @@ class TypedColumn[-T, U](
}
new TypedColumn[T, U](newExpr, encoder)
}
+
+ /** Creates a TypedColumn based on the given expression. */
+ private def withExpr(newExpr: Expression): TypedColumn[T, U] =
+ new TypedColumn[T, U](newExpr, encoder)
+
+ /**
+ * Gives the TypedColumn a name (alias).
+ * If the current TypedColumn has metadata associated with it, this
metadata will be propagated
+ * to the new column.
+ *
+ * @group expr_ops
+ * @since 2.0.0
+ */
+ override def as(alias: String): TypedColumn[T, U] = withExpr {
--- End diff --
and it can be `new TypedColumn[T, U](super.name(alias).expr, encoder)`
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