Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19929#discussion_r158598667
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/UDFRegistration.scala ---
@@ -23,6 +23,7 @@ import scala.reflect.runtime.universe.TypeTag
import scala.util.Try
import org.apache.spark.annotation.InterfaceStability
+import org.apache.spark.api.python.PythonEvalType
import org.apache.spark.internal.Logging
import org.apache.spark.sql.api.java._
import org.apache.spark.sql.catalyst.{JavaTypeInference, ScalaReflection}
--- End diff --
`UDFRegistration`'s doc:
```
* @note The user-defined functions must be deterministic.
```
Looks obsolete.
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