Since https://github.com/odoo/odoo/pull/103510, the read_group parameter "groupby" can no longer contain implicit duplicates. For example groupby=['date', 'date:month] doesn't work anymore. Here we remove all duplicates from groupby before making a read_group. closes odoo/odoo#143792 Signed-off-by: Julien Mougenot (jum) <jum@odoo.com>