CBRT(expression)
$ nano mathcbrt.txt
$ cat mathcbrt.txt
$ hdfs dfs-put mathcbrt.txt /pigexample
$ pig
grunt> A = LOAD '/pigexample/mathcbrt.txt' AS (a1:int) ;
grunt> DUMP A;
grunt> Result = FOREACH A GENERATE CBRT(a1); grunt> DUMP Result;