Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18659#discussion_r138272886
  
    --- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala 
---
    @@ -83,10 +83,23 @@ private[spark] case class PythonFunction(
      */
     private[spark] case class ChainedPythonFunctions(funcs: 
Seq[PythonFunction])
     
    +/**
    + * Enumerate the type of command that will be sent to the Python worker
    + */
    +private[spark] object PythonEvalType {
    +  val NON_UDF = 0
    +  val SQL_BATCHED_UDF = 1
    +  val SQL_ARROW_UDF = 2
    --- End diff --
    
    the new udf parameter is pandas `Series`, I think it's more accurate to 
call it `SQL_PANDAS_UDF`.


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