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