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Pig, mail # user - UDF allowed return data types?

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UDF allowed return data types?
Yang 2012-03-12, 18:16
I tried to return a Set<String> from my UDF, but it seems to give some

what are the allowed return data types in UDF?

is it constrained to those in the "Pig Types" section in
http://wiki.apache.org/pig/UDFManual  ?