Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12893#discussion_r62136859
--- 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] =
--- End diff --
we don't need this i think? it's used only once.
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