UDF to check if String is Numeric or Integer

[Prashant Kommireddi]

Is there a UDF that could be used to check if a string is numeric (or an
Integer). This would be nice to have (if we don't already) as part of
Piggybank.
A lot of other tools such as Splunk, AbInitio have this UDF built-in and I
know companies are making an effort to move to Hadoop/Pig which could use
this.

Use Case:
In raw logs there are certain filters/conditions applied based on whether a
particular field/value is numeric or not. For eg, SPLIT A INTO CATEGORY1 IF
IsInt($0), CATEGORY2 IF !IsInt($0);

Thoughts?

-Prashant