Re: BUG #17853: COLLATE does not work with numeric column references in ORDER BY - Mailing list pgsql-bugs

On 3/18/23 23:44, PG Bug reporting form wrote:
> The following bug has been logged on the website:
> 
> Bug reference:      17853
> Logged by:          Branko Radovanovic
> Email address:      branko.radovanovic.zg@gmail.com
> PostgreSQL version: 13.4
> Operating system:   Debian
> Description:
> 
> The following SQL:
> 
> values ('a')
> order by 1 collate "C";
> 
> ...returns an error: SQL Error [42804]: ERROR: collations are not supported
> by type integer
> 
> In the above query, "1" is not an integer but a column reference, so it
> should be treated as well-formed and work the same as with the actual column
> label:

There is an argument that this should work.  There is also an argument 
that using numerical column references is not (or rather, is no longer) 
Standard SQL and should not be used.
-- 
Vik Fearing