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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-777) Code refactoring: Create optimization out of store/load post processing code
Date Wed, 29 Apr 2009 06:47:30 GMT

     [ https://issues.apache.org/jira/browse/PIG-777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gunther Hagleitner updated PIG-777:
-----------------------------------

    Attachment: log_message.patch

log_message.patch adds a the message "Removing unnecessary load operation ..." when we remove
the load from the logical plan.

> Code refactoring: Create optimization out of store/load post processing code
> ----------------------------------------------------------------------------
>
>                 Key: PIG-777
>                 URL: https://issues.apache.org/jira/browse/PIG-777
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Gunther Hagleitner
>         Attachments: log_message.patch
>
>
> The postProcessing method in the pig server checks whether a logical graph contains stores
to and loads from the same location. If so, it will either connect the store and load, or
optimize by throwing out the load and connecting the store predecessor with the successor
of the load.
> Ideally the introduction of the store and load connection should happen in the query
compiler, while the optimization should then happen in an separate optimizer step as part
of the optimizer framework.

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