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

    https://github.com/apache/spark/pull/8354#discussion_r42450109
  
    --- 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 --
    
    `instance` is now not null just for macro function, which contains detail 
of how to handle input data. I've removed caching UDF because hive udf does not 
coerces functions to be stateless, afaik. And I don't think creating UDF 
instance will make any performance regression.


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