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

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

(let res_sink (DataSink 'result))

(let write (lambda '(world x y) (block '(
   (let world (Write! world res_sink (Key) (String '==============) '()))
   (let world (Write! world res_sink (Key) (== x y) '('('type))))
   (return world)
))))

(let world (Apply write world (Null) (Null)))
(let world (Apply write world (Null) (Nothing (OptionalType (DataType 'String)))))
(let world (Apply write world (Int32 '0) (Null)))
(let world (Apply write world '((Null)) '((Null))))
(let world (Apply write world '((Int32 '1) (Null)) '((Int32 '1) (Null))))
(let world (Apply write world '((Int32 '1) (Nothing (OptionalType (DataType 'String)))) '((Int32 '1) (Nothing (OptionalType (DataType 'String))))))


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