Re: Unicode grapheme clusters

On Thu, Jan 19, 2023 at 07:37:48PM -0500, Greg Stark wrote:
> This is how we've always documented it. Postgres treats code points as
> "characters" not graphemes.
>
> You don't need to go to anything as esoteric as emojis to see this either.
> Accented characters like é have no canonical forms that are multiple code
> points and in some character sets some accented characters can only be
> represented that way.
>
> But I don't think there's any reason to consider changing e existing functions.
> They have to be consistent with substr and the other string manipulation
> functions.
>
> We could add new functions to work with graphemes but it might bring more pain
> keeping it up to date....

I am not sure what you are referring to above? character_length? I was
talking about display length, and psql uses that --- at some point, our
lack of support for graphemes will cause psql to not align columns.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

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