Re: varchar as primary key

Jeff Davis <pgsql@j-davis.com> writes:
> If you're using a non-C locale, it's slower than strcmp() too.
> PostgreSQL has to do an extra memcpy() in order to use strcoll(),
> because strings in postgresql aren't necessarily NULL-terminated and
> there's no such thing as strncoll(), unfortunately (a comment in the
> code points this out).

The memcpy is the least of the problem --- in many non-C locales,
strcoll() is simply a dog, because the collation rules are ridiculously
complex.

            regards, tom lane