Pradeep Kamath updated PIG-385:

    Assignee: Pradeep Kamath
      Status: Patch Available  (was: Open)

The code changes to implement the null constant are in jira issue PIG-538 and 
explained in 
 The attached patch adds more tests to the unit test case TestNullConstant and 
has changes to support having "null" as a map constant's value but to disallow 
use of "null" as a map constant's key.

> Should support 'null' as a constant
> -----------------------------------
>                 Key: PIG-385
>                 URL: https://issues.apache.org/jira/browse/PIG-385
>             Project: Pig
>          Issue Type: New Feature
>          Components: impl
>    Affects Versions: types_branch
>            Reporter: Alan Gates
>            Assignee: Pradeep Kamath
>            Priority: Minor
>             Fix For: types_branch
>         Attachments: PIG-385.patch
> It would be nice to be able to do things like:
> B = foreach A generate $0 > 0 ? $0 : null;
> but right now null is not allowed as a constant.  This null constant should 
> be allowed anywhere an expression would be, and should be castable (that is 
> (int)null).

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