Rohini Palaniswamy commented on PIG-4897:

bq. We shall also document it.
  Thanks for reminding. We missed that in the patch.

   There are some test failures with TestMacroExpansion. Can you look into 

> Scope of param substitution for run/exec commands
> -------------------------------------------------
>                 Key: PIG-4897
>                 URL: https://issues.apache.org/jira/browse/PIG-4897
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Koji Noguchi
>            Assignee: Koji Noguchi
>         Attachments: pig-4897-v01-notestyet.patch, pig-4897-v02.patch, 
> pig-4897-v03.patch, pig-4897-v04.patch, pig-4897-v05.patch, 
> pig-4897-v06.patch, pig-4897-v07.patch, pig-4897-v08.patch
> After PIG-3359, pig param substitution became global in that parameter 
> declared in the pig script called from {{run}} or {{exec}} would live after 
> that script finishes.  
> This created an interesting situation.
> {code:title=test1.pig}
> exec -param output=/tmp/deleteme111 test1_1.pig
> exec -param output=/tmp/deleteme222 test1_1.pig
> {code}
> {code:title=test1_1.pig}
> %default myout '$output.out';
> A = load 'input.txt' as (a0:int);
> store A into '$myout';
> {code}
> Running {{test1.pig}} would try to run two jobs that both tries to write to 
> /tmp/deleteme111 and fail.  (Second param output=/tmp/deleteme222 is ignored.)

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