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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
# prepare python udf
(let ui32 (DataType 'Uint32))
(let udfType (CallableType '('1) '(ui32) '(ui32) '((OptionalType ui32))))
(let udfScript (String '"def Add(x, y): return x + (y if y is not None else 1)"))
(let udf (ScriptUdf 'Python 'Add udfType udfScript))
# call udf
(let x (Uint32 '20))
(let result (Apply udf x))
# output result with type
(let res_sink (DataSink 'result))
(let world (Write! world res_sink (Key) result '( '('type) )))
# finish
(let world (Commit! world res_sink))
(return world)
)
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