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

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

(let res_sink (DataSink 'result))
(let list (AsList (Int32 '1) (Int32 '2) (Int32 '3)))
(let world (Write! world res_sink (Key) (OrderedMultiMap list
   (lambda '(x) x (+ x (Int32 '10)) x)) '('('type))))
(let world (Write! world res_sink (Key) (MultiMap (LazyList list)
   (lambda '(x) x (- (Int32 '7) x) (* x x))) '('('type))))
(let world (Write! world res_sink (Key) (Collect (MultiMap (ToFlow list)
   (lambda '(x) x (+ x (Int32 '-3)) (Int32 '0)))) '('('type))))
(let world (Commit! world res_sink))
(return world)
)