| From: | Arthur Zakirov <a(dot)zakirov(at)postgrespro(dot)ru> |
|---|---|
| To: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
| Cc: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Steele <david(at)pgmasters(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [PATCH] Generic type subscripting |
| Date: | 2017-09-20 15:19:35 |
| Message-ID: | 20170920151934.GA12130@zakirov.localdomain |
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| Lists: | pgsql-hackers |
On Wed, Sep 20, 2017 at 09:35:06AM -0400, Peter Eisentraut wrote:
>
> The difference is that those create associations between two separate
> objects (cast: type1 <-> type2, transform: type <-> language). A
> subscripting is just a property of a type.
>
> --
> Peter Eisentraut http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
Yes, indeed. I agree.
As a conclusion:
- additional field are needed to pg_type for *_fetch and *_assign functions to solve dependency problem
- ALTER TYPE requires a modification to add or drop subscripting from existing type (I am not sure that it should be done by this patch, maybe better to do it by a separate patch)
--
Arthur Zakirov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
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