Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22063#discussion_r209136524
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/UDFRegistration.scala ---
@@ -114,6 +114,7 @@ class UDFRegistration private[sql] (functionRegistry:
FunctionRegistry) extends
val types = (1 to x).foldRight("RT")((i, s) => {s"A$i, $s"})
val typeTags = (1 to x).map(i => s"A$i: TypeTag").foldLeft("RT:
TypeTag")(_ + ", " + _)
val inputTypes = (1 to x).foldRight("Nil")((i, s) =>
{s"ScalaReflection.schemaFor[A$i].dataType :: $s"})
+ val nullableTypes = (1 to x).foldRight("Nil")((i, s) =>
{s"ScalaReflection.schemaFor[A$i].nullable :: $s"})
--- End diff --
Yeah that can be optimized. I'll fix the MiMa issue too by restoring a
constructor.
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