On 09/06/2013 01:02 AM, Robert Haas wrote:
> On Wed, Sep 4, 2013 at 11:02 PM, Quan Zongliang <quanzongliang@gmail.com> wrote:
>> I think of a new idea.
>> Add a compare method column to pg_collation.
>> Every collation has its own compare function or null.
>> When function varstr_cmp is called, if specified collation
>> has compare function, call it instead of strcoll().
>
> I think we're going to need to have two kinds of collations:
> OS-derived collations (which get all of their smarts from the OS), and
> PG-internal collations (which use PG-aware code for everything).
> Which I suspect is a bit more involved than what you're imagining, but
> mixing and matching doesn't seem likely to end well.
>
> However, what you're proposing might serve as a useful demonstration
> of how much performance there is to be gained here.
>
Understood.
I just try to speed up text compare, not redesign locale.
Do you have a plan to do this?
Thank you.
Quan Zongliang