[sqlite] Function lower on index expressions not allowed ?

[Jan Nijtmans]

2015-09-08 0:04 GMT+02:00 Richard Hipp <drh at sqlite.org>:
> My guess:  You are using ICU or some other extension that is replacing
> the built-in lower() function with another.  And that extension is not
> marking its new lower() function as SQLITE_DETERMINISTIC.
> (https://www.sqlite.org/c3ref/c_deterministic.html)

Just wondering, why doesn't ICU mark "upper" and "lower"
as SQLITE_DETERMINISTIC ?
    <http://www.sqlite.org/src/artifact/b2732aef0b076e42?ln=461-469+482-483>

Regards,
        Jan Nijtmans