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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-262) Pig needs an optimizer
Date Fri, 13 Jun 2008 14:18:45 GMT

    [ https://issues.apache.org/jira/browse/PIG-262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12604893#action_12604893
] 

Alan Gates commented on PIG-262:
--------------------------------

If we feel that strongly that we need to insert the casts before type checking, I think I
should just put it in the validator framework.  There's no reason to split the optimizer over
it, when the validator can handle it.

> Pig needs an optimizer
> ----------------------
>
>                 Key: PIG-262
>                 URL: https://issues.apache.org/jira/browse/PIG-262
>             Project: Pig
>          Issue Type: Sub-task
>          Components: impl
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>         Attachments: optimizer.patch
>
>
> We need to add an optimizer to pig.  This will enable us to do some traditional optimizations,
such as filter and projection pushing, join order and execution choices, etc.  It will also
enable optimizations specific to map/reduce (such as using the combiner).
> The optimizer will need to operate at various levels, including the logical, physical,
and possibly map/reduce plan levels.

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