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Pig >> mail # user >> NVL

I'd like to write a java UDF that functions more or less the same as a SQL
NVL command.  I've been stymied on writing a general function by the fact
that I want it to work on all data types--in particular chararrays and
numeric types.  If I extend EvalFunc<Object> then even if what I return is
a Double, Pig can't use it in a subsequent numeric calculation.

Any suggestions?  Has someone already written this UDF?