ydb/yql/essentials/tests/s-expressions/suites/InMem/StreamMap.yqls

(
#comment
(let config (DataSource 'config))

(let res_sink (DataSink 'result))
(let list (AsList (Uint32 '1) (Uint32 '2) (Uint32 '3)))
(let world (Write! world res_sink (Key) (Collect (Map (Iterator list) 
   (lambda '(x) (+ (Uint32 '10) x)))) '('('type))))
(let world (Commit! world res_sink))
(return world)
)