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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-217) Syntax Errors
Date Mon, 13 Sep 2010 22:25:33 GMT

    [ https://issues.apache.org/jira/browse/PIG-217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12909025#action_12909025
] 

Alan Gates commented on PIG-217:
--------------------------------

Since part of the current language specification is that parallel is allowed after any operator,
we cannot simply remove it.  We could add warnings to tell users when parallel isn't doing
anything for them, and deprecate it's usage for those operators.

But even then I'm not sure how useful this is.  Some operators will sometimes make use of
parallel and sometimes not, depending on implementation (e.g. join would use it for hash join,
but not for merge join).  So users will always have to know when parallel is and isn't helping
them.

> Syntax Errors
> -------------
>
>                 Key: PIG-217
>                 URL: https://issues.apache.org/jira/browse/PIG-217
>             Project: Pig
>          Issue Type: Sub-task
>            Reporter: Amir Youssefi
>             Fix For: 0.9.0
>
>
> This is a sub-task for Syntax Errors and use cases for it. 
> Having PARALLEL in wrong places is confusing for many users. I just saw somebody putting
it after STORE. Adding it to FILTER is very common as well.

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