processing a variable size map in pig

processing a variable size map in pig

I have a data set that is incoming as
(str,[[40,74],[50,75],[60,73],[70,43]])
and I need to be able to get this in the output variable using pig:
str, 40, 74
str , 50, 75
str, 60, 73
str, 70, 43
and this could be variable set of elements.
Tried with tokenizing and then flatten, but that doesn't help as it
creates token using comma. and end up being this way..
str , {([[40), (74]), ... }
Would any one suggestions on if I could use built in functions or write a
UDF for this.
many thanks, Ana