calling python udfs with varargs

[Stan Rosenberg]

Hi,

I have a simple python udf which takes a variable number of (string)
arguments and returns the first non-empty one.
I can see that the udf is invoked from pig but no arguments are being passed.

Here is the script:
=========================================================

#!/usr/bin/python

from org.apache.pig.scripting import *

@outputSchema("s:chararray")
def firstNonempty(*args):
    print args
    for v in args:
        if len(v) != 0:
           return v
    return ''

if __name__ == "__main__":
   Pig.compile("""
   data = load 'input.txt' AS (string1:chararray, string2:chararray);
   data = foreach data generate firstNonempty(string1, string2) as id,
string1, string2;
   dump data;
   """).bind().runSingle()

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Thanks!

stan