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From "Jeff Zhang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1423) Suggest to add clear command in grunt to clear the relation variable
Date Thu, 20 May 2010 06:23:54 GMT

     [ https://issues.apache.org/jira/browse/PIG-1423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jeff Zhang updated PIG-1423:

    Status: Patch Available  (was: Open)

> Suggest to add clear command in grunt to clear the relation variable
> --------------------------------------------------------------------
>                 Key: PIG-1423
>                 URL: https://issues.apache.org/jira/browse/PIG-1423
>             Project: Pig
>          Issue Type: New Feature
>          Components: grunt
>    Affects Versions: 0.8.0
>            Reporter: Jeff Zhang
>            Assignee: Jeff Zhang
>             Fix For: 0.8.0
>         Attachments: PIG-1423.patch
> The relation name in pig script can been considered as variable of programming language.
One risk of the current grunt is that user may use the previous defined relation name by typo
after a long period of work on grunt. And it is difficult for users to track this problem.
 E.g. the following red "students" is not the user intend to use, but here grunt won't throw
any error meesage.
> students = load 'a.txt';
> ....
> student = load 'b.txt';
> result = foreach {color:red}students{color} generate $0;
> The clear command is to clear the variable defined before, then if users use the relation
name defined before, grunt will throw error message. And this command also will be useful
to let user reuse the relation names especially when he's doing lots of experiments for one
specific task.

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