fix: return -1, 1 or 0 not +ve or -ve value
fix: return -1, 1 or 0 not +ve or -ve value

Collate returns +ve and -ve value add switch case on it
to return -1, 1 or 0 only
Signed-off-by: Lakshya Singh <c1d0f63b4850308b3322f4be6a4de88e5ef26271@gmail.com>

mahak/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,mahak/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,mahak/vitess