PIG: Transform based on value in field

[Ashish Gupta]

I want to something like this

B = FOREACH A GENERATE a1, *if a2 = 0: a2=a2+1 else a2*, a3)

how to do " if a2 = 0: a2=a2+1 else a2" in PIG

(or it could be "if a2 matches < some regex>: a2+0 else a2")


I am using Pig 0.10