Or, the single-language (HiveQL) alternative might be (i.e. I haven't tested it): select f1, f2, if(max(if(f3='P',f4,null)) is null,0,max(if(f3='P',f4,null))) pf4, if(max(if(f3='P',f5,null)) is null,0,max(if(f3='P',f5,null))) pf5, if(max(if(f3='N',f4,null)) is null,0,max(if(f3='N',f4,null))) nf4, if(max(if(f3='N',f5,null)) is null,0,max(if(f3='N',f5,null))) nf5 from mytable group by f1, f2;
________________________________ From: Edward Capriolo <edlinuxg...@gmail.com> To: "user@hive.apache.org" <user@hive.apache.org> Sent: Saturday, June 22, 2013 7:48 PM Subject: Re: how to combine some rows into 1 row in hive Using hives streaming feature is a nice option for this as it is a fairly natural way to work with entire rows and return multiple columns select transform a,b,c,d using /bin/pipeprogram as a, b ,c ,d You an also write a UDTF user defined Table function as well because this can return more then one column. On Sat, Jun 22, 2013 at 6:36 PM, zuohua zhang <zuo...@gmail.com> wrote: I have the following table: >f1 f2 f3 f4 f5 >a1 a2 P x1 x2 >a1 a2 N x3 x4 >a1 a3 N x5 x6 >a4 a6 P x7 x8 > > >i want to convert to below: >f1 f2 pf4 pf5 nf4 nf5 >a1 a2 x1 x2 x3 x4 >a1 a3 0 0 x5 x6 >a4 a6 x7 x8 0 0 > > >basically, when f3="P", I want f4 f5 to be moved to pf4 pf5 >when f3="N", i want f4 f5 to be moved to nf4 nf5 >when there is no "P" or "N" rows for the record, I want to fill in zeros in >the corresponding fields. > > >how to do it? > > >Thanks, >Zuohua > >
