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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-922) Logical optimizer: push up project
Date Fri, 14 Aug 2009 18:31:14 GMT

    [ https://issues.apache.org/jira/browse/PIG-922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743347#action_12743347
] 

Daniel Dai commented on PIG-922:
--------------------------------

There will be three patches for this issue:
phase 1: Infrastructure to find relevant input columns from output column
phase 2: Infrastructure to prune column for each relational operator
phase 3: push up project optimization rule

> 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: 0.4.0
>
>
> 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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