will, not exactly. I want a subset of A with all fields, and field a1 is distinct. for example: A is: 1,2,3 1,2,3 4,5,6
What I want is : 1,2,3 4,5,6 How can I do this with the keyword distinct? Haitao Yao yao.e...@gmail.com weibo: @haitao_yao Skype: haitao.yao.final 在 2012-6-27，下午2:06， Jonathan Coveney 写道： > If you JUST want a1, then you would do > A = LOAD 'data' AS (a1:int,a2:int,a3:int); > B = DISTINCT (foreach A generate a1); > > basically you project the column you want, and distinct on it. > > 2012/6/26 Haitao Yao <yao.e...@gmail.com> > >> I want a subset of A with a1 value distinct. >> the current distinct will compare all the fields in A, which is not what I >> want. >> >> >> >> Haitao Yao >> yao.e...@gmail.com >> weibo: @haitao_yao >> Skype: haitao.yao.final >> >> 在 2012-6-27，上午11:18， Jonathan Coveney 写道： >> >>> What is your desired output? Sounds like you want a group. >>> >>> 2012/6/26 Haitao Yao <yao.e...@gmail.com> >>> >>>> hi, >>>> How can I distinct only one field of a relation? >>>> here's the demo: >>>> >>>> A = LOAD 'data' AS (a1:int,a2:int,a3:int); >>>> B = distinct A by a1; >>>> >>>> >>>> how can I do this? >>>> >>>> >>>> >>>> Haitao Yao >>>> yao.e...@gmail.com >>>> weibo: @haitao_yao >>>> Skype: haitao.yao.final >>>> >>>> >> >>
