UDF that could be used to check if a String is numeric (or an Integer). Several tools such as Splunk, AbInitio have this UDF built-in and companies making an effort to move to Hadoop/Pig could use this.
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);
|Status||Resolved [ 5 ]||Closed [ 6 ]|
|Status||Patch Available [ 10002 ]||Resolved [ 5 ]|
|Hadoop Flags||Reviewed [ 10343 ]|
|Fix Version/s||0.11 [ 12318878 ]|
|Resolution||Fixed [ 1 ]|
|Status||Open [ 1 ]||Patch Available [ 10002 ]|