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https://issues.apache.org/jira/browse/PIG-1423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892992#action_12892992
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Olga Natkovich commented on PIG-1423:
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I am not sure I like the idea of unsetting variables as a grant command. I
think it can cause more confusion and generate more problems then it would help
to solve. I think the right way to solve this problem is to define scope for
variables as part of our turing complete effort.
If we have an agreement on this, I would like to unlinik it from 0.8.0 release.
> 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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