Re: "JSON does not support infinite date values"

On 02/26/2015 03:55 AM, Tim Smith wrote:
> Hi,
>
> As far as I'm aware, JSON has no data types as such, and so why is
> Postgres (9.4.1) attempting to impose its own nonsense constraints ?
> Surely it should just insert the word 'infinity' into the JSON output,
> just like it displays in a simple SQL query ?

It did:

test=> select version();
                                                            version


-----------------------------------------------------------------------------------------------------------------------------
  PostgreSQL 9.3.6 on i686-pc-linux-gnu, compiled by gcc (SUSE Linux)
4.8.1 20130909 [gcc-4_8-branch revision 202388], 32-bit
(1 row)

test=> select to_json(row('infinity'::date));
       to_json
-------------------
  {"f1":"infinity"}
(1 row)


seems to have changed:

test=# select version();
                                                            version


-----------------------------------------------------------------------------------------------------------------------------
  PostgreSQL 9.4.1 on i686-pc-linux-gnu, compiled by gcc (SUSE Linux)
4.8.1 20130909 [gcc-4_8-branch revision 202388], 32-bit
(1 row)

test=# select to_json(row('infinity'::date));
ERROR:  date out of range
DETAIL:  JSON does not support infinite date values.


so will have to wait until the question Andres posed is answered.

>
> create table app_test.foo(a text,b date,c date,d boolean);
>
> create view app_test.bar as select * from app_test.foo where
> b<=now()::date and c>=now()::date and d=true;
>
> insert into app_test.foo(a,b,c,d) values ('zzz','2014-12-31','2014-02-01',true);
> insert into app_test.foo(a,b,c,d) values ('zzz','2015-02-01','infinity',true);
>
>
> foobar=> select * from app_test.bar where a='zzz' order by c asc limit 1;
>    a  |     b      |    c     | d
> -----+------------+----------+---
>   zzz | 2015-02-01 | infinity | t
> (1 row)
>
>
> CREATE FUNCTION app_test.foobar(p_a text) RETURNS json AS $$
> DECLARE
> v_row app_test.bar%ROWTYPE;
> v_json json;
> BEGIN
> select * into strict v_row from app_test.bar where a=p_a order by c asc limit 1;
> select row_to_json(v_row) into v_json;
> return v_json;
> END;
> $$ LANGUAGE plpgsql;
>
>
> foobar=> select app_test.foobar('zzz');
> ERROR:  date out of range
> DETAIL:  JSON does not support infinite date values.
> CONTEXT:  SQL statement "select row_to_json(v_row)"
> PL/pgSQL function app_test.foobar(text) line 7 at SQL statement
>
>


--
Adrian Klaver
adrian.klaver@aklaver.com