There is no setting, however you can rewrite your query as the following: table1x = foreach table1 generate (a is null?'':a) as a, (b is null?'':b) as b; table2x = foreach table2 generate (a is null?'':a) as a, (b is null?'':b) as b; k = cogroup table1x by (a,b),table2x by (a,b);
Daniel On 9/9/15, 1:38 AM, "李运田" <[email protected]> wrote: >table1 >,aa >14, >12,bb > > >table2 >,aa >14, >12,bb > > >k = cogroup table1 by (a,b),table2 by (a,b); >k: >((,aa),{(,aa)},{}) >((,aa),{},{(,aa)}) >((14,),{(14,)},{(14,)}) >((12,bb),{(12,bb)},{(12,bb)}) >when I use cogroup,(,aa) null is in front,(14,) null is not in front. is >there a parameter I can get result like this >((,aa),{(,aa)},{(,aa)}) >((14,),{(14,)},{(14,)}) >((12,bb),{(12,bb)},{(12,bb)}) >thank you.
