SET @@global.ROCKSDB_DELETE_CF = 'nonexistent_cf';
ERROR 42000: Variable 'rocksdb_delete_cf' can't be set to the value of 'nonexistent_cf'
SET @@global.ROCKSDB_DELETE_CF = '__system__';
ERROR 42000: Variable 'rocksdb_delete_cf' can't be set to the value of '__system__'
SET @@global.ROCKSDB_DELETE_CF = 'default';
ERROR 42000: Variable 'rocksdb_delete_cf' can't be set to the value of 'default'
