(row)
return row['database_name'], row['user_name'], row['query_signature'], row['query_hash'], row['query_plan_hash']
:param row: a normalized row from STATEMENT_METRICS_QUERY
    :return: a tuple uniquely identifying this row
:param row: a normalized row from STATEMENT_METRICS_QUERY
    :return: a tuple uniquely identifying this row
: param row : a normalized row from STATEMENT_METRICS_QUERY : return : a tuple uniquely identifying this row
def _row_key(row):
    """
    :param row: a normalized row from STATEMENT_METRICS_QUERY
    :return: a tuple uniquely identifying this row
    """
    return row['database_name'], row['user_name'], row['query_signature'], row['query_hash'], row['query_plan_hash']
def _row_key ( row ) : return row [ 'database_name' ] , row [ 'user_name' ] , row [ 'query_signature' ] , row [ 'query_hash' ] , row [ 'query_plan_hash' ]