Re: function signature allow "default" keyword

Hi

út 16. 5. 2023 v 5:11 odesílatel jian he <jian(dot)universality(at)gmail(dot)com>
napsal:

>
>
> On Mon, May 15, 2023 at 5:00 PM Thomas Kellerer <shammat(at)gmx(dot)net> wrote:
>
>> jian he schrieb am 15.05.2023 um 10:33:
>> >
>> > function idea.
>> > allow function calling using the default keyword for any of the input
>> arguments.
>> >
>> > example: https://dbfiddle.uk/FQwnfdmm
>> > So something like this "SELECT * FROM customer_orders(2579927,
>> 'order_placed_on DESC', default, 2);"
>> > should work.
>>
>>
>> You can use named parameters when calling the function, that will use the
>> default value for those not mentioned:
>>
>> SELECT *
>> FROM customer_orders(_customer_id => 2579927,
>> _sort_field_and_direction => 'order_placed_on DESC',
>> _offset => 2);
>>
>>
>>
>>
>
> select proname
> ,proargtypes
> ,pg_get_expr(pp.proargdefaults,0,true)
> ,pronargdefaults
> from pg_proc pp
> where pp.proname = 'customer_orders';
> ----------return-------------
> proname | customer_orders
> proargtypes | 23 25 23 23 1082 1082
> pg_get_expr | 10, 0, CURRENT_DATE - 30, CURRENT_DATE
> pronargdefaults | 4
>
> table insert works, i guess because pg_attribute has column ordinal number
> (left to right).
> but pg_proc only counts the number of arguments that have a default value.
>

The tables don't support overloading.

I cannot to have tab1(a int, b int), tab1(a int, b int, c int)

but I can have

proc1(int, int), proc1(int, int, int)

Regards

Pavel