Re: Fwd: Re: proposal: schema variables

Laurenz Albe <laurenz.albe@cybertec.at>

From: Laurenz Albe <laurenz.albe@cybertec.at>

To: Bruce Momjian <bruce@momjian.us>, Pavel Stehule <pavel.stehule@gmail.com>

Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>

Date: 2025-01-17T16:43:13Z

Lists: pgsql-hackers, pgsql-performance

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Move WAL sequence code into its own file
- a87987cafca6 19 (unreleased) cited
Add ExplainState argument to pg_plan_query() and planner().
- c83ac02ec730 19 (unreleased) cited
Don't include access/htup_details.h in executor/tuptable.h
- 1a8b5b11e48a 19 (unreleased) cited
Refactor to avoid code duplication in transformPLAssignStmt.
- b0fb2c6aa5a4 19 (unreleased) cited
Avoid including commands/dbcommands.h in so many places
- 325fc0ab14d1 19 (unreleased) cited
Restrict psql meta-commands in plain-text dumps.
- 71ea0d679543 19 (unreleased) cited
Split func.sgml into more manageable pieces
- 4e23c9ef65ac 19 (unreleased) cited
Fix squashing algorithm for query texts
- 0f65f3eec478 18.0 cited
EXPLAIN: Always use two fractional digits for row counts.
- 95dbd827f2ed 18.0 cited
Preliminary refactoring of plpgsql expression construction.
- a654af21ae52 18.0 cited
plpgsql: pure parser and reentrant scanner
- 7b27f5fd36cb 18.0 cited
Add some sanity checks in executor for query ID reporting
- 24f520594809 18.0 cited
Fix misleading error message context
- 4af123ad45bd 18.0 cited
Add macros for looping through a List without a ListCell.
- 14dd0f27d7cd 17.0 cited

On Fri, 2025-01-17 at 11:01 -0500, Bruce Momjian wrote:
> On Fri, Jan 17, 2025 at 04:55:07PM +0100, Pavel Stehule wrote:
> > pá 17. 1. 2025 v 16:35 odesílatel Bruce Momjian <bruce@momjian.us> napsal:
> > 
> >     So this feature would be like global GUC variables, with permission
> >     control?
> > 
> > + types and domain type check - holds data in binary form - there are not
> > conversions binary, text
> > + it is declared - so less space for misuse is there. Custom GUC are absolutely
> > tolerant
> > + it is a fully database object, only owner can alter it,  and event triggers
> > are supported, sinval
> > + possibility to set mutability, default value
> 
> Okay, good summary.  Now, can people give feedback that they would want
> this committed to PostgreSQL?

I would like to see this committed too, or at least relevant parts of it.

It addresses the perennial problem of people putting state into placeholder
GUCs to pass information between the application and the database
(SET myapp.application_id = 'user_laurenz').

Also, it cann pass information between the code in DO statements and
the surrounding SQL code.

Yours,
Laurenz Albe