Reads flows that were started by a given flow from the database.

def ReadChildFlowObjects(self, client_id, flow_id, cursor=None):
    """Reads flows that were started by a given flow from the database."""
    query = ("SELECT " + self.FLOW_DB_FIELDS +
             "FROM flows WHERE client_id=%s AND parent_flow_id=%s")
    cursor.execute(
        query,
        [db_utils.ClientIDToInt(client_id),
         db_utils.FlowIDToInt(flow_id)])
    return [self._FlowObjectFromRow(row) for row in cursor.fetchall()]