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help / color / mirror / Atom feedFrom: Vik Fearing <[email protected]>
To: Jeff Davis <[email protected]>
To: Joe Conway <[email protected]>
To: Ian Lawrence Barwick <[email protected]>
Cc: [email protected]
Cc: Peter Eisentraut <[email protected]>
Subject: Re: Add CASEFOLD() function.
Date: Tue, 17 Jun 2025 17:37:37 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On 16/12/2024 18:49, Jeff Davis wrote:
> One question I have is whether we want this function to normalize the
> output.
Yes, we do.
I am sorry that I am so late to the party, but I am currently writing
the Change Proposal for the SQL Standard for this function.
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.
--
Vik Fearing
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Subject: Re: Add CASEFOLD() function.
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