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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-922) Logical optimizer: push up project
Date Thu, 03 Dec 2009 02:19:21 GMT

     [ https://issues.apache.org/jira/browse/PIG-922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-922:
---------------------------

    Attachment: PIG-922-p3_14.patch

Address the review comments from Pradeep. Actually we do not need to do anything special for
order by. We only prune columns on the upfront LOLoad in the logical plan. Order by will read
intermediate input file (In the case if we do not have input schema, order by will read user
input file directly, however, prune columns only kick in when user give an input schema, so
it is not the case), nothing will be pruned. 

> Logical optimizer: push up project
> ----------------------------------
>
>                 Key: PIG-922
>                 URL: https://issues.apache.org/jira/browse/PIG-922
>             Project: Pig
>          Issue Type: New Feature
>          Components: impl
>    Affects Versions: 0.3.0
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: 0.6.0
>
>         Attachments: PIG-922-p1_0.patch, PIG-922-p1_1.patch, PIG-922-p1_2.patch, PIG-922-p1_3.patch,
PIG-922-p1_4.patch, PIG-922-p2_preview.patch, PIG-922-p2_preview2.patch, PIG-922-p3_1.patch,
PIG-922-p3_10.patch, PIG-922-p3_11.patch, PIG-922-p3_12.patch, PIG-922-p3_13.patch, PIG-922-p3_14.patch,
PIG-922-p3_2.patch, PIG-922-p3_3.patch, PIG-922-p3_4.patch, PIG-922-p3_5.patch, PIG-922-p3_6.patch,
PIG-922-p3_7.patch, PIG-922-p3_8.patch, PIG-922-p3_9.patch
>
>
> This is a continuation work of [PIG-697|https://issues.apache.org/jira/browse/PIG-697].
We need to add another rule to the logical optimizer: Push up project, ie, prune columns as
early as possible.

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