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Re: Unicode Normalization

From: "David E(dot) Wheeler" <david(at)kineticode(dot)com>
To: pg1(at)thetdh(dot)com
Cc: "PG Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Unicode Normalization
Date: 2009-09-24 15:36:37
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Sep 24, 2009, at 6:24 AM, pg(at)thetdh(dot)com wrote:

> In a context using normalization, wouldn't you typically want to  
> store a normalized-text type that could perhaps (depending on  
> locale) take advantage of simpler, more-efficient comparison  
> functions?

That might be nice, but I'd be wary of a geometric multiplication of  
text types. We already have TEXT and CITEXT; what if we had your NTEXT  
(normalized text) but I wanted it to also be case-insensitive?

> Whether you're doing INSERT/UPDATE, or importing a flat text file,  
> if you canonicalize characters and substrings of identical meaning  
> when trivial distinctions of encoding are irrelevant, you're better  
> off later.  User-invocable normalization functions by themselves  
> don't make much sense.

Well, they make sense because there's nothing else right now. It's an  
easy way to get some support in, and besides, it's mandated by the SQL  

> (If Postgres now supports binary- or mixed-binary-and-text flat  
> files, perhaps for restore purposes, the same thing applies.)

Don't follow this bit.



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