Re: polymorphic parameters limits - correct solution?

Поиск
Список
Период
Сортировка
От Pavel Stehule
Тема Re: polymorphic parameters limits - correct solution?
Дата
Msg-id CAFj8pRDU3gEHcHXCUkOmc3Si3-1OFVMXY+gpyFem_XsLbZ+yUg@mail.gmail.com
обсуждение исходный текст
Ответ на Re: polymorphic parameters limits - correct solution?  (Alvaro Herrera <alvherre@alvh.no-ip.org>)
Список pgsql-hackers


2018-01-16 3:21 GMT+01:00 Alvaro Herrera <alvherre@alvh.no-ip.org>:
Pavel Stehule wrote:
> Hi
>
> I played with introduction of new pair of Polymorphic Parameters - like
> anyXelement and anyXarray. Now, I don't think so enhancing PP is good way
> now. Without significant redesign there are not practical append more code
> there.
>
> Why this is a issue? The extension's authors are not able to specify result
> type without enumeration of all possible function signatures. Similar
> situation is in argument processing - there are workaround based on "any"
> type.

I cannot offer any advice for your "helper" (because I don't really
understand what the helper does), but I am reminded of this old thread:
https://www.postgresql.org/message-id/flat/20090908161210.GD549%40alvh.no-ip.org

yes - it is same issue. There are possible two ways

1. with polymorphic types
2. with some aux functions that dynamically generate current function's signature - used in core (coalesce, greather, ...)

@1 is difficult when you can implement different strategies about work with arguments

a) depends on first
b) depends on common type
c) depends on second

So I am thinking so the best possibility is allow same functionality that we use in core to extension authors.

Regards

Pavel




... in which datatype "any" was one of the offered tools, and also from
whence the format() function sprung.  Nice ...

--
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

В списке pgsql-hackers по дате отправления:

Предыдущее
От: David Rowley
Дата:
Сообщение: Re: [HACKERS] UPDATE of partition key
Следующее
От: David Rowley
Дата:
Сообщение: Re: ALTER TABLE ADD COLUMN fast default