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https://issues.apache.org/jira/browse/PIG-990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitriy V. Ryaboy updated PIG-990:
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    Attachment: pinned_options_2.patch

- "using regular" will now translate into the default join method (hash join at 
the moment).
- "using hash" is an option in case we change what "regular" is
- renamed REGULAR to HASH in the Join code
- added the new group type option to CoGROUP, pinned where appropriate.

> Provide a way to pin LogicalOperator Options
> --------------------------------------------
>
>                 Key: PIG-990
>                 URL: https://issues.apache.org/jira/browse/PIG-990
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>            Reporter: Dmitriy V. Ryaboy
>            Assignee: Dmitriy V. Ryaboy
>            Priority: Minor
>             Fix For: 0.6.0
>
>         Attachments: pinned_options.patch, pinned_options_2.patch
>
>
> This is a proactive patch, setting up the groundwork for adding an optimizer.
> Some of the LogicalOperators have options. For example, LOJoin has a variety 
> of join types (regular, fr, skewed, merge), which can be set by the user or 
> chosen by a hypothetical optimizer.  If a user selects a join type, pig 
> philoophy guides us to always respect the user's choice and not explore 
> alternatives.  Therefore, we need a way to "pin" options.  

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