ydb/yql/essentials/tests/s-expressions/suites/Builtins/HasItems.yql

(
#comment
(let mr_source (DataSource 'yt 'plato))
(let x (Read! world mr_source (Key '('table (String 'Input))) '('key 'subkey 'value) '()))
(let world (Left! x))
(let table1 (Right! x))
(let table1map (Map table1 (lambda '(item) (block '(
   (let value (Member item 'value))
   (let newValue (Member item 'value))
   (let newValue (Concat newValue (String '" => ")))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (HasItems (AsList (String 'zzz)))))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (HasItems (List (ListType (DataType 'Int32))))))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (HasItems (AsDict '((Int32 '234) (String 'zzz))))))))
   (let newValue (Concat newValue (Concat (String '" ") (ToString (HasItems (Dict (DictType (DataType 'Int32) (DataType 'String))))))))
   (let s (Struct))
   (let s (AddMember s 'key (String '.)))
   (let s (AddMember s 'subkey (String  '.)))
   (let s (AddMember s 'value newValue))
   (return s)
)))))
(let mr_sink (DataSink 'yt (quote plato)))
(let world (Write! world mr_sink (Key '('table (String 'Output))) table1map '('('mode 'append))))
(let world (Commit! world mr_sink))
(return world)
)