ydb/yql/essentials/tests/s-expressions/suites/ImplictCasts/InsideOpt.yql

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

(let res_sink (DataSink 'result))
(let data (AsList (Just (Int64 '12))))
(let data (Append data (Just (Int32 '-5))))
(let world (Write! world res_sink (Key) data '('('type))))
(let world (Commit! world res_sink))
(return world)
)