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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))
(let res_sink (DataSink 'result))
# Optional
(let value (Nothing (OptionalType (DataType 'Int32))))
(let world (Write! world res_sink (Key) (HasNull value) '()))
(let value (Just (Nothing (OptionalType (DataType 'Int32)))))
(let world (Write! world res_sink (Key) (HasNull value) '()))
# Null
(let value (Null))
(let world (Write! world res_sink (Key) (HasNull value) '()))
(let value (Just (Null)))
(let world (Write! world res_sink (Key) (HasNull value) '()))
(let value (Nothing (OptionalType (NullType))))
(let world (Write! world res_sink (Key) (HasNull value) '()))
(let value (Just (Nothing (OptionalType (NullType)))))
(let world (Write! world res_sink (Key) (HasNull value) '()))
# Tuple
(let value '((Int32 '1) (String 'test) (Nothing (OptionalType (DataType 'Int32)))))
(let world (Write! world res_sink (Key) (HasNull value) '()))
# Struct
(let value (AsStruct '('a (Int32 '1)) '('b (Just (Nothing (OptionalType (DataType 'Int32)))))))
(let world (Write! world res_sink (Key) (HasNull value) '()))
# Variant
(let valueType (VariantType (TupleType (DataType 'Int32) (NullType))))
(let value (Variant (Null) '1 valueType))
(let world (Write! world res_sink (Key) (HasNull value) '()))
(let valueType (VariantType (StructType '('a (DataType 'Int32)) '('b (OptionalType (DataType 'String))))))
(let value (Variant (Nothing (OptionalType (DataType 'String))) 'b valueType))
(let world (Write! world res_sink (Key) (HasNull value) '()))
# List
(let value (AsList (Null) (Int32 '1) (Int32 '2)))
(let world (Write! world res_sink (Key) (HasNull value) '()))
(let value (AsList (Int32 '1) (Int32 '2) (Null)))
(let world (Write! world res_sink (Key) (HasNull value) '()))
(let world (Commit! world res_sink))
(return world)
)
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