if - else logic in Pig

[Katukuri, Jay]

Hello,
How do we implement the following "if-else" SQL logic in Pig ?

Select column-1, column-2,  if(column-3 >=200, 20, column-3) column_new_3
>From table-1

In the above SQL , if the value of a field (column-3) is greater than threshold 
(200), it uses some other value(20). Else, it uses the original value itself.

Thanks,
Jay