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 > >
