[jira] [Created] (HIVE-12217) FunctionInfo#getFunctionClass should not return null for persistent functions

[JIRA]

Michał Warecki created HIVE-12217:
-------------------------------------

             Summary: FunctionInfo#getFunctionClass should not return null for 
persistent functions
                 Key: HIVE-12217
                 URL: https://issues.apache.org/jira/browse/HIVE-12217
             Project: Hive
          Issue Type: Bug
          Components: Hive
    Affects Versions: 1.2.1
         Environment: ALL
            Reporter: Michał Warecki


For persistent UDF functions #className attribute is being stored in 
FunctionInfo class instance.
When you try to fetch function class using #getFunctionClass method, then null 
is being returned:

public Class<?> getFunctionClass() {
    if (isGenericUDF()) {
      if (genericUDF instanceof GenericUDFBridge) {
        return ((GenericUDFBridge) genericUDF).getUdfClass();
      } else {
        return genericUDF.getClass();
      }
    } else if (isGenericUDAF()) {
      if (genericUDAFResolver instanceof GenericUDAFBridge) {
        return ((GenericUDAFBridge) genericUDAFResolver).getUDAFClass();
      } else {
        return genericUDAFResolver.getClass();
      }
    } else if (isGenericUDTF()) {
      return genericUDTF.getClass();
    }
    if(isTableFunction()) {
      return this.tableFunctionResolver;
    }
    return null;
  }

This causes NPE being thrown in Apache Spark when it lookups for Hive UDF.
I think it should return #className if none of the conditions are met so 
something like that:

if(className != null) {
  return Class.forName(className);
}
return null;



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