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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
# prepare python udf
(let i64 (DataType 'Int64))
(let udfType (CallableType '() '((ListType i64)) '((ListType i64))))
(let udfScript (String '@@
def g(input):
def gen():
return (long(x + 42) for x in input)
return gen
@@))
(let udf (ScriptUdf 'Python 'g udfType udfScript))
# call udf
(let result (Apply udf (AsList (Int64 '1) (Int64 '2) (Int64 '3))))
# output result with type
(let sink (DataSink 'result))
(let world (Write! world sink (Key) result '( '('type) )))
# finish
(return (Commit! world sink))
)
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