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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 '() '(ui32) '(ui32) '(ui32)))
(let udfScript (String '"def Sum(x, y): return x + y"))
(let udf (ScriptUdf 'Python3 'Sum udfType udfScript))
# call udf
(let x (Uint32 '10))
(let y (Uint32 '32))
(let result (Apply udf x y))
# 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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