def __init__(self, cluster, groups, group_to_nodes, group_to_instances,
               want_diskparams):
    self.groups = groups
    self.group_to_nodes = group_to_nodes
    self.group_to_instances = group_to_instances
    self.cluster = cluster
    self.want_diskparams = want_diskparams

    # Used for individual rows
    self.group_ipolicy = None
    self.ndparams = None
    self.group_dp = None
Initializes this class.
dataset/ETHPy150Open ganeti/ganeti/lib/query.py/GroupQueryData.__init__