ydb/yql/essentials/tests/s-expressions/suites/YtNative/PureUdf.yql

(
#comment
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(let res_sink (DataSink 'result))
(let data (Apply (Udf 'SimpleUdf.Echo) (String 'abc)))
(let world (Write! world res_sink (Key) data '('('type))))
(let world (Commit! world res_sink))
(return world)
)