From: | Peter Eisentraut <peter(at)eisentraut(dot)org> |
---|---|
To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
Cc: | Pg Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: cataloguing NOT NULL constraints |
Date: | 2023-09-05 11:29:47 |
Message-ID: | 471cd41b-c345-3bee-fe97-061f74eba5b8@eisentraut.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On 31.08.23 12:02, Alvaro Herrera wrote:
> In constraint_column_usage, you're adding a relkind to the catalog scan
> that goes through pg_depend for CHECK constraints. Here we can rely on
> a simple conkey[1] check and a separate UNION ALL arm[q5]; this is also
> faster when there are many tables.
>
> The third view definition looks ok. It's certainly very nice to be able
> to delete XXX comments there.
The following information schema views are affected by the not-null
constraint catalog entries:
1. CHECK_CONSTRAINTS
2. CONSTRAINT_COLUMN_USAGE
3. DOMAIN_CONSTRAINTS
4. TABLE_CONSTRAINTS
Note that 1 and 3 also contain domain constraints. So as long as the
domain not-null constraints are not similarly catalogued, we can't
delete the separate not-null union branch. (3 never had one, so
arguably a bit buggy.)
I think we can fix up 4 by just deleting the not-null union branch.
For 2, the simple fix is also easy, but there are some other options, as
you discuss above.
How do you want to proceed?
From | Date | Subject | |
---|---|---|---|
Next Message | Zhijie Hou (Fujitsu) | 2023-09-05 11:34:14 | RE: persist logical slots to disk during shutdown checkpoint |
Previous Message | Jelte Fennema | 2023-09-05 11:29:36 | Re: proposal: psql: show current user in prompt |