Dolt uppercases a lowercase non-ASCII initial in SOUNDEX

[Yibo-Dong]

what happened

Dolt returns an uppercased Soundex code for a lowercase accented initial, unlike MySQL's preserved lowercase output.

Environment

Dolt main (commit c3b5ce3c67f8677ca08a0a58d8c03cdc95bff8b7). MySQL version 8.0.43.

How to reproduce

Run the corresponding SQL in a fresh Dolt repository.

SELECT FIRST_VALUE(SOUNDEX('é')) OVER () AS actual FROM (SELECT 1 AS z) q;

Expected Result

MySQL returns é000.

Actual Result

Dolt returns É000.