Question

Does Apache Pig support an UNGROUP operation ? I guess No. So could any one help me out with this probblem?
I have a rows of the form

1,a-b-c
2,d-e-f
3,g-h

I would like to expand it to the form

1,a
1,b
1,c
2,d
2,e
2,f
3,g
3,h

Any help appreciated.

Answer 1

You should probably use the builtin STRSPLIT to split your second field into several tokens, and then apply FLATTEN to create 1 row per element. Something like this:

A = LOAD 'input.txt' as (id, data);

B = FOREACH A GENERATE id, FLATTEN(STRSPLIT(data,'-'));