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

(
(let config (DataSource 'config))

(let list1 (AsList (String 'a) (String 'b) (String 'c)))
(let list2 (AsList (String 'd) (String 'e) (String 'f)))
(let res_sink (DataSink 'result))
(let world (Write! world res_sink
    (Key)
    (Skip (Extend list1 list2) (Uint64 '1)) '('('type))))

(let world (Write! world res_sink
    (Key)
    (Skip (Extend list1 list2) (Uint64 '5)) '('('type))))

(let world (Commit! world res_sink))
(return world)
)