On 17.06.25 17:37, Vik Fearing wrote:
For <fold> (which includes LOWER() and UPPER()), the text says in
Section 6.35 GR 7.e:
If the character set of <character factor> is UTF8, UTF16, or UTF32,
then FR is replaced by
Case:
i) If the <search condition> S IS NORMALIZED evaluates to True,
then NORMALIZE (FR)
ii) Otherwise, FR.
Here, FR is the result of the function and S is its argument.
It does not appear to me that our LOWER and UPPER functions obey this
rule, so there is a valid argument that we should continue to ignore it.
Or, we can say that we have at least one of three compliant.
The SQL standard also says in a few other places that normalization
should be applied, and we do none of those, so this is probably not a
reason to change CASEFOLD at this point.