Re: Order changes in PG16 since ICU introduction

On 5/18/23 1:55 PM, Jeff Davis wrote:
> On Wed, 2023-05-17 at 19:59 -0400, Jonathan S. Katz wrote:
>> I did a quicker read through this time. LGTM overall. I like what you
>> did with the explanations around sensitivity (now it makes sense).
>
> Committed, thank you.

\o/

> There are a few things I don't understand that would be good to
> document better:
>
> * Rules. I still don't quite understand the use case: are these for
> people inventing new languages? What is a plausible use case that isn't
> covered by the existing locales and collation settings? Do rules make
> sense for a database default collation? Are they for language experts
> only or might an ordinary developer benefit from using them?

From my read of them, as an app developer I'd be very unlikely to use
this. Maybe there is something with building out some collation rules
vis-a-vis an extension, but I have trouble imagining the use-case. I may
also not be the target audience for this feature.

> * The collation types "phonebk", "emoji", etc.: are these variants of
> particular locales, or do they make sense in multiple locales? I don't
> know where they fit in or how to document them.

I remember I had a exploratory use case for "phonebk" but I couldn't
figure out how to get it to work. AIUI from random searching, the idea
is that it provides the "phonebook" rules for ordering "names" in a
particular locale, but I couldn't get it to work.

> * I don't understand what "kc" means if "ks" is not set to "level1".

Me neither, but I haven't stared at this as hard as others.

Thanks,

Jonathan