How to parse JSON numbers as bigint?

As a follow-up to this FAQ, it seems that the sp_parse_json system procedure only supports numbers as double or integer:

begin
   declare MyJson long varchar;
   select '{"MyDouble": -12345678901234.567890,
            "MyEValue": -1e6,
            "MyInt": -2147483648,
            "MyBigInt1": 2147483648,
            "MyBigInt2": -1234567890123456789,
            "MyBit": 1}' into MyJson;
   drop variable if exists sql_row;
   call sp_parse_json ('sql_row', MyJson);

   select '1 MyDouble' as "Variable", exprtype('select sql_row.MyDouble', 1) as Data_Type, sql_row.MyDouble as Value 
   union all
   select '2 MyEValue', exprtype('select sql_row.MyEValue', 1), sql_row.MyEValue
   union all
   select '3 MyInt', exprtype('select sql_row.MyInt', 1), sql_row.MyInt
   union all
   select '4 MyBigInt1', exprtype('select sql_row.MyBigInt1', 1), sql_row.MyBigInt1
   union all
   select '5 MyBigInt2', exprtype('select sql_row.MyBigInt2', 1), sql_row.MyBigInt2
   union all
   select '6 MyBit', exprtype('select sql_row.MyBit', 1), sql_row.MyBit
   order by 1;
end;

returns

1 MyDouble;double;-12345678901234,568
2 MyEValue;double;-1000000
3 MyInt;integer;-2147483648
4 MyBigInt1;integer;2147483647 <-- wrong
5 MyBigInt2;integer;-2147483648 <-- wrong
6 MyBit;integer;1

This was tested with 17.0.10.6175.

Resume: MyBigInt1 and MyBigInt2 are wrongly limited to the maximum positive resp. negative integer values, so it seems that JSON numbers in the format without fraction and exponent are wrongly casted to integer instead of bigint or other "huger" types.

json data-type

asked 30 Sep '20, 05:03

Volker Barth
39.2k●353●537●806
accept rate: 33%

FWIW, it does not make a difference if the according variable used with sp_parse_json is declared to have a bigint component beforehand - it will nevertheless be returned as an integer:

begin
   declare MyJson long varchar;
   select '{"MyBigInt1": 2147483648}' into MyJson;
   drop variable if exists sql_row;
   create variable sql_row row(MyBigInt1 bigint);
   select '1 MyBigInt1', exprtype('select sql_row.MyBigInt1', 1), sql_row.MyBigInt1;
   call sp_parse_json ('sql_row', MyJson);
   select '1 MyBigInt1', exprtype('select sql_row.MyBigInt1', 1), sql_row.MyBigInt1;
end;

returns

1 MyBigInt1,bigint,(NULL) -- before sp_parse_json
1 MyBigInt1,integer,2147483647 -- after sp_parse_json

(05 Oct '20, 03:36) Volker Barth

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question asked: 30 Sep '20, 05:03

question was seen: 705 times

last updated: 05 Oct '20, 03:36

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How to parse JSON numbers as bigint?

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