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