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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
# prepare python udf
(let world (Configure! world (DataSource 'config) 'ImportUdfs 'custom_python.so))
(let json (DataType 'Json))
(let udfType (CallableType '() '(json) '(json)))
(let udfScript (String '"from custom_python.foo import bar"))
(let udf (ScriptUdf 'CustomPython 'bar udfType udfScript))
# call udf
(let x (Json '@@{"abc":1}@@))
(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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