Re: Function with defval returns error

Hello

2008/12/15 Rushabh Lathia <rushabh(dot)lathia(at)gmail(dot)com>:
> Hi All,
>
> Following test returns error on 8.4 cvs head. it looks like an issue
>
> Testcase: (8.4 CVS head)
> ====================
> CREATE OR REPLACE FUNCTION f007( a INTEGER,
> b INTEGER DEFAULT 10 ) RETURNS INTEGER
> AS $$
> select 10;
> $$ language sql;
>
> CREATE OR REPLACE FUNCTION f007( a INTEGER DEFAULT 10,
> b INTEGER DEFAULT 10,
> c INTEGER DEFAULT 10) RETURNS INTEGER
> AS $$
> select 10;
> $$ language sql;
>
> CREATE OR REPLACE FUNCTION f007( a TIMESTAMP DEFAULT to_date('01-JUN-06
> 14:03:50', 'DD-MON-YY HH24:MI:SS') ) RETURNS TIMESTAMP
> AS $$
> select current_date::timestamp;
> $$ language sql;
>
> postgres=# SELECT f007( to_date('01-JUN-06 14:03:50', 'DD-MON-YY
> HH24:MI:SS') );
> ERROR: functions with parameter defaults f007(integer, integer, integer)
> and f007(integer, integer) are ambiguous
>
>
> I think this should not return error as the input args here is timestamp...
> inputs?
>

you are right - this is known problem - because postgresql identify
ambigonous calling and choise the best function in two places - simply
we identify ambigonous call to early (algoritm is more fast then
smart) - so ugly efect is identifivation of stored ambiguous functions
when you call other function with same name.

Pavel

> Thanks,
> Rushabh Lathia
> www.EnterpriseDB.com