Re: [HACKERS] [PATCH] Generic type subscripting

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От Dmitry Dolgov
Тема Re: [HACKERS] [PATCH] Generic type subscripting
Дата
Msg-id CA+q6zcVoVJAEZB55MJ60pYvrr52efgySfyAo52XO8Acy6mHpJg@mail.gmail.com
обсуждение исходный текст
Ответ на Re: [HACKERS] [PATCH] Generic type subscripting  (Dmitry Dolgov <9erthalion6@gmail.com>)
Ответы Re: [HACKERS] [PATCH] Generic type subscripting  (Arthur Zakirov <a.zakirov@postgrespro.ru>)
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> On 11 September 2017 at 23:55, Dmitry Dolgov <9erthalion6@gmail.com> wrote:
>
> Sure, an SQL command for that purpose is much better than a runtime check.
> I'm going to add such command to the patch, thank you for the information!

So, I've implemented a patch for that in form of a `DEPENDS ON` syntax for creating a function.
Basically it looks like this (and initially I was looking for something like that in the documentation,
you can find a complete example in the test `create_function_3.sql`):

```
CREATE FUNCTION custom_subscripting_extract(internal)
   RETURNS internal;

CREATE FUNCTION custom_subscripting_assign(internal)
   RETURNS internal;

CREATE FUNCTION custom_subscript_parse(internal)
   RETURNS internal
   DEPENDS ON custom_subscripting_extract, custom_subscripting_assign;
```

I hope it sounds reasonable and can help to address a problem with dependencies between functions.

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