Re: Questions about support function and abbreviate

Hello,

the abbrev_converter is applied whenever it is defined. The values are
sorted using the abbreviated comparator first using the shortened version,
and if there is a tie the system asks the real full comparator to resolve
it.

This article seems to be rather comprehensive:
https://brandur.org/sortsupport

On Sat, Jun 12, 2021 at 9:51 AM Han Wang <hanwgeek(at)gmail(dot)com> wrote:

> Hi all,
>
> I am trying to implement a sort support function for geometry data types
> in PostGIS with the new feature `SortSupport`. However, I have a question
> about this.
>
> I think it is hardly to apply a sort support function to a complex data
> type without the `abbrev_converter` to simply the data structure into a
> single `Datum`. However, I do not know how the system determines when to
> apply the converter.
>
> I appreciate any answers or suggestions. I am looking forward to hearing
> from you.
>
> Best regards,
> Han
>

--
Darafei "Komяpa" Praliaskouski
OSM BY Team - http://openstreetmap.by/