Just tell us what issue you are facing and what output do you want? give a demo data and tell what kind of output you want.
Instead of posting query post the demo data and what outcome you do want.. Regards Yogesh Kumar > Date: Tue, 6 Nov 2012 23:04:15 -0500 > Subject: Re: How to create an empty alias > From: [email protected] > To: [email protected] > > Sorry, for late response. In case you still need this. > You can try to read from file:/dev/null > This should work for most formats. > > 2012/10/18 Kevin LION <[email protected]> > > > Hello, > > > > I've a script which group lot of alias and is doing some operation on it. > > But it can happen that I don't need one of this alias. To don't change my > > code, I would like to create an empty alias. How can I do that ? > > > > Actually my code is like that : > > A = LOAD A AS (id, a1, a2); > > B = LOAD A AS (id, b1, b2); > > C = LOAD A AS (id, c1, c2); > > GROUP = COGROUP A BY id, B BY id, C BY id; > > GROUP2 = FOREACH GROUP GENERATE TOTUPLE(A, B, C) AS ALL; > > OPERATION = FOREACH GROUP2 GENERATE MyUDF(ALL); > > > > And I would like to do something like that : > > A = LOAD A AS (id, a1, a2); > > B = LOAD A AS (id, b1, b2); > > *C = LOAD NULL AS (id, c1, c2); <- Generate an empty alias with column id, > > c1, c2;* > > GROUP = COGROUP A BY id, B BY id, C BY id; > > GROUP2 = FOREACH GROUP GENERATE TOTUPLE(A, B, C) AS ALL; > > OPERATION = FOREACH GROUP2 GENERATE MyUDF(ALL); > > > -- > Best regards, > Vitalii Tymchyshyn
