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Posted to dev@hive.apache.org by "Samuel Yuan (JIRA)" <ji...@apache.org> on 2013/01/25 20:33:12 UTC

[jira] [Commented] (HIVE-3940) Track columns accessed in each table in a query

    [ https://issues.apache.org/jira/browse/HIVE-3940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13562940#comment-13562940 ] 

Samuel Yuan commented on HIVE-3940:
-----------------------------------

https://reviews.facebook.net/D8193
                
> Track columns accessed in each table in a query
> -----------------------------------------------
>
>                 Key: HIVE-3940
>                 URL: https://issues.apache.org/jira/browse/HIVE-3940
>             Project: Hive
>          Issue Type: Task
>          Components: Query Processor
>            Reporter: Samuel Yuan
>            Assignee: Samuel Yuan
>            Priority: Minor
>         Attachments: HIVE-3940.1.patch.txt
>
>
> Similar to partition access logs, we need to have columns access logs, so later we can build tools/reports to inform users if there are wasted columns in a table to be trimmed.

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