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https://issues.apache.org/jira/browse/HIVE-3940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13564724#comment-13564724
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Kevin Wilfong commented on HIVE-3940:
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Can you update the patch on the JIRA to match what's in Phabricator?
> 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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