Обсуждение: json/jsonb inconsistence - 2

postgres=# select  '["\u0000"]'::json->0; ?column?
---------- "\u0000"
(1 row)

Time: 1,294 ms
postgres=# select  '["\u0000"]'::jsonb->0; ?column?
----------- "\\u0000"
(1 row)

It seems to me that escape_json() is wrongly used in jsonb_put_escaped_value(), 
right name of escape_json() is a escape_to_json().

-- 
Teodor Sigaev                                   E-mail: teodor@sigaev.ru
  WWW: http://www.sigaev.ru/
 

On 05/29/2014 08:00 AM, Teodor Sigaev wrote:
> postgres=# select  '["\u0000"]'::json->0;
>  ?column?
> ----------
>  "\u0000"
> (1 row)
>
> Time: 1,294 ms
> postgres=# select  '["\u0000"]'::jsonb->0;
>  ?column?
> -----------
>  "\\u0000"
> (1 row)
>
> It seems to me that escape_json() is wrongly used in 
> jsonb_put_escaped_value(), right name of escape_json() is a 
> escape_to_json().


That's a bug. I will look into it. I think we might need to special-case 
\u0000 on output, just as we do on input.

cheers

andrew

On 05/29/2014 08:15 AM, Andrew Dunstan wrote:
>
> On 05/29/2014 08:00 AM, Teodor Sigaev wrote:
>> postgres=# select '["\u0000"]'::json->0;
>>  ?column?
>> ----------
>>  "\u0000"
>> (1 row)
>>
>> Time: 1,294 ms
>> postgres=# select  '["\u0000"]'::jsonb->0;
>>  ?column?
>> -----------
>>  "\\u0000"
>> (1 row)
>>
>> It seems to me that escape_json() is wrongly used in 
>> jsonb_put_escaped_value(), right name of escape_json() is a 
>> escape_to_json().
>
>
> That's a bug. I will look into it. I think we might need to 
> special-case \u0000 on output, just as we do on input.


Actually, this is just the tip of the iceberg.

Here's what 9.3 does:
   andrew=# select array_to_json(array['a','\u0000','b']::text[]);        array_to_json   ---------------------
["a","\\u0000","b"]


I'm now wondering if we should pass though any unicode escape 
(presumably validated to some extent). I guess we can't change this in 
9.2/9.3 because it would be a behaviour change.

These unicode escapes have given us more trouble than any other part of 
the JSON spec :-(

cheers

andrew

> Actually, this is just the tip of the iceberg.


Funny, but
postgres=# select '\u0000'::text;  text
-------- \u0000
(1 row)

postgres=# select array['\u0000']::text[];    array
------------- {"\\u0000"}

postgres=# select '{"\u0000"}'::text[];  text
--------- {u0000}

postgres=# select '{"\\u0000"}'::text[];    text
------------- {"\\u0000"}

&%) I'm crazy about that. Suppose, we shouldn't worry about array type, 
just make output the same for json/jsonb
-- 
Teodor Sigaev                      E-mail: teodor@sigaev.ru                                      WWW:
http://www.sigaev.ru/