ydb/yql/essentials/tests/s-expressions/suites/Builtins/FlattenMembersOptional2.yqls

(
(let config (DataSource 'config))

(let res_sink (DataSink 'result))

(let value (AsStruct '('a (Int8 '1)) '('b (Just (String 'str))) '('c '((Int32 '2) (Int64 '3)))))
(let flattenMembersResult (FlattenMembers '('"" (Just value))))
(let world (Write! world res_sink (Key) flattenMembersResult '('('type))))

(let value (Nothing (TypeOf (Just value))))
(let flattenMembersResult (FlattenMembers '('"x" value)))
(let world (Write! world res_sink (Key) flattenMembersResult '('('type))))

(let value (AsStruct))
(let flattenMembersResult (FlattenMembers '('"x" value)))
(let world (Write! world res_sink (Key) flattenMembersResult '('('type))))

(let value (Just (AsStruct)))
(let flattenMembersResult (FlattenMembers '('"" value)))
(let world (Write! world res_sink (Key) flattenMembersResult '('('type))))

(let value (Nothing (TypeOf value)))
(let flattenMembersResult (FlattenMembers '('"x" value)))
(let world (Write! world res_sink (Key) flattenMembersResult '('('type))))

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

)