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https://issues.apache.org/jira/browse/PIG-922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784985#action_12784985
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Pradeep Kamath commented on PIG-922:
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I reviewed the changes to pass the load signature to the slicer/Slice and
PigStorage for column pruning to work on the backend - the changes look good.
The one change I wasn't clear about was the use of signature in order by since
currently LOSort's alias is used as the signature and that would not be useful
to the Slicer/slice or PigStorage in the backend since they would expect the
LOLoad's alias.
> 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_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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