Introduction:
Some languages have special casing rules, most notoriously the turkish language.
Example:

"ID".loLowerCase(); // "id"

Locale.setDefault(new Locale("tr")) // turkish client

"ID".toLowerCase(); // "ıd" note the dottles i

To get language independent casing one has to use something like this
"ID".toLowerCase(Locale.ROOT)

Connector Issue:
ColoumnNameMap#getIndex uses getLowerCase().
That means turkish people will not be able to access Coloumns like "ID", because mariaDb incorrectly maps them internally to "ıd" instead of "id".

Workarounds: Dont use the letter i in your coloums or don't have turkish customers. So actually not really.

Sugested fix: replace all Usages of toLowerCase() with toLowerCase(Locale.Root). Same technique applies to toUpperCase()