Re: improve Chinese locale performance - Mailing list pgsql-hackers

From Robert Haas
Subject Re: improve Chinese locale performance
Date
Msg-id CA+TgmoZ+2p-ObskiuNNW15E4fabEvphBmP7aysA8pWeMTbAB0Q@mail.gmail.com
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In response to Re: improve Chinese locale performance  (Quan Zongliang <quanzongliang@gmail.com>)
Responses Re: improve Chinese locale performance
List pgsql-hackers
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.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



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