Re: Questions about support function and abbreviate
| От | Darafei "Komяpa" Praliaskouski |
|---|---|
| Тема | Re: Questions about support function and abbreviate |
| Дата | |
| Msg-id | CAC8Q8tJzY1DcyfE4cS8hrnJKzgP4SLbbxyNMNFyA+4BVYgpqeA@mail.gmail.com обсуждение исходный текст |
| Ответ на | Questions about support function and abbreviate (Han Wang <hanwgeek@gmail.com>) |
| Ответы |
Re: Questions about support function and abbreviate
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| Список | pgsql-hackers |
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@gmail.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
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