On 09/06/2013 01:02 AM, Robert Haas wrote:
On Wed, Sep 4, 2013 at 11:02 PM, Quan Zongliang <quanzongli...@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.


I just try to speed up text compare, not redesign locale.

Do you have a plan to do this?

Thank you.

Quan Zongliang

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