Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8354#discussion_r42454432
  
    --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveShim.scala 
---
    @@ -196,14 +194,8 @@ private[hive] object HiveShim {
           if (instance != null) {
             instance.asInstanceOf[UDFType]
           } else {
    -        val func = Utils.getContextOrSparkClassLoader
    +        Utils.getContextOrSparkClassLoader
               .loadClass(functionClassName).newInstance.asInstanceOf[UDFType]
    -        if (!func.isInstanceOf[UDF]) {
    --- End diff --
    
    Doing a bit more research:
    
    It looks like #3640 added this driver-side creation and serialization of 
the UDF not as a performance optimization but as a correctness issue. Given 
this, will this PR break the correctness for those UDFs?


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