Re: Improve the performance of Unicode Normalization Forms.

On Tue, 2025-06-03 at 00:51 +0300, Alexander Borisov wrote:
> As promised, I continue to improve/speed up Unicode in Postgres.
> Last time, we improved the lower(), upper(), and casefold()
> functions. [1]
> Now it's time for Unicode Normalization Forms, specifically
> the normalize() function.

Did you compare against other implementations, such as ICU's
normalization functions? There's also a rust crate here:

https://github.com/unicode-rs/unicode-normalization

that might have been optimized.

In addition to the lookups themselves, there are other opportunities
for optimization as well, such as:

* reducing the need for palloc and extra buffers, perhaps by using
buffers on the stack for small strings

* operate more directly on UTF-8 data rather than decoding and re-
encoding the entire string

Regards,
Jeff Davis