return me the authors who have cooperated with " H. V. Jagadish " or " Divesh Srivastava " . 
return authors ;return #1 that  have cooperated with  H. V. Jagadish ;return #1 that  have cooperated with  Divesh Srivastava ;return #2 ,  #3
['select', 'filter', 'filter', 'union']