See Contributing your work in https://cwiki.apache.org/confluence/display/PIG/HowToContribute
It talks about how to upload the patch to JIRA.
On Mar 19, 2012, at 6:02 AM, Sachith Withana wrote:
> Hi folks,
> I prepared a patch for the PIG-2226 bug and I'd like to know how I can
> submit it.
> It's great to have the "Open Source Feeling" :)
> Sachith Dhanushka Withana
> Student, Dept. of Computer Science and Eng.