Thanks I tried something like this and it worked, but I have one more question:
grunt> B = foreach A GENERATE FORM_ID, SET_ID; grunt> C= DISTINCT B; What's the different between foreach A GENERATE FORM_ID, SET_ID; and foreach A GENERATE A.FORM_ID, A.SET_ID;, To me they look the same but results are different. On Wed, Apr 11, 2012 at 1:57 PM, Prashant Kommireddi <[email protected]>wrote: > You are doing a distinct on a Tuple, and not a Bag? > > In your example, DISTINCT on Field name on each record/tuple would not make > sense as its always a single value. You need to group by on a certain key > before a distinct. > > > On Wed, Apr 11, 2012 at 1:53 PM, Mohit Anchlia <[email protected] > >wrote: > > > I am trying to get distinct from 2 fields in a record. something like > > select distinct a, b from c; So I wrote this in pig which is actually not > > working. I did: > > > > > > A = LOAD '/examples/form_out/part-m-00000' USING PigStorage('\t') AS > > (FILE_NAME:chararray,FORM_ID:chararray,SET_ID:chararray); > > > > B = foreach A {dist = DISTINCT A.FORM_ID, A.SET_ID; GENERATE dist;} > > > > ERROR 1000: Error during parsing. Invalid alias: A in {FILE_NAME: > chararray > > ... > > > > But this doesn't seem to be working. I thought A is a tuple and form_id > and > > set_id are fields that I can do DISTINCT on. I saw similar example online > > but not exactly same. > > >
