Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/23275#discussion_r240231883
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -4255,11 +4255,11 @@ object functions {
*
* @group udf_funcs
* @since 2.0.0
+ *
+ * @deprecated("please use the typed `udf` methods", "3.0.0")
--- End diff --
with Scala 2.12, type and nullability info need to be retrieved during
compile time, this method is not very useful and we should deprecate it.
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