ydb/yql/essentials/tests/s-expressions/suites/Optimizers/InnerLambda.yqls

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

(let res_sink (DataSink 'result))
(let list1 (AsList (String 'a) (String 'b)))
(let list2 (AsList (String 'c) (String 'd)))
(let data (FlatMap list1 (lambda '(x) (block '(
   (let myList (Map list2 (lambda '(y) (block '(
       (return (Concat x y)))))))
   (return myList)
)))))
    
(let world (Write! world res_sink (Key) data '('('type))))
(let world (Commit! world res_sink))
(return world)
)