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(
#comment
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))

(let init (lambda '(x) x))
(let update (lambda '(x y) (+ x y)))
(let save (lambda '(x) x))
(let load (lambda '(x) x))
(let merge (lambda '(x y) (+ x y)))
(let finish (lambda '(x) x))
(let sum (AggregationTraits (DataType 'Uint32) init update save load merge finish (Null)))
(let res_sink (DataSink 'result))
(let world (Write! world res_sink (Key) (FormatType (TypeOf sum)) '('('type))))
(let world (Commit! world res_sink))
(return world)
)