[jira] [Updated] (PIG-1464) Should clean the Graph when register another Pig Script

["Bill Graham (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-1464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bill Graham updated PIG-1464:
-----------------------------

    Status: Open  (was: Patch Available)

Canceling patch since there's concern about backward compatibility. I don't think this change is worth the potential breakage it might incur.
                
> Should clean the Graph when register another Pig Script
> -------------------------------------------------------
>
>                 Key: PIG-1464
>                 URL: https://issues.apache.org/jira/browse/PIG-1464
>             Project: Pig
>          Issue Type: Bug
>          Components: grunt
>    Affects Versions: 0.8.0
>            Reporter: Jeff Zhang
>            Assignee: Jeff Zhang
>         Attachments: PIG_1463.patch
>
>
> In the current implementation, the variable names in pig script are all global variable. This make one pig script know the variable in other scripts. In my opinion, this is not right. Every relation name in pig script should be local variable, otherwise it will bring in unexpected result.  This issue relates to PIG-1423
> E.g there are two pig script as follows:
> Test_1.pig
> {code}
> a = load 'data/b.txt' ;
> {code}
> Test_2.pig
> {code}
> b = foreach a generate $0;   // "a" is recognized by Grunt although it is in Test_1.pig
> {code}
> And the following execute normally, do not throw any exception
> {code}
> PigServer pig=new PigServer(ExecType.Local);
> pig.registerScript("Test_1.pig");
> pig.registerScript("Test_2.pig");
> {code}

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