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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-2013) Add a parameter in the Partition object to indicate it's privilege is the same as table level privilege
Date Mon, 28 Feb 2011 22:44:36 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000585#comment-13000585
] 

Ning Zhang commented on HIVE-2013:
----------------------------------

One caveat for this approach is that when the table-level privilege is changed, all partitions
have to be checked and reset the property appropriately. 

Assume changing table-level privilege is rare and querying tables whose partitions have different
privileges is common, this optimization makes sense in most use cases. 

> Add a parameter in the Partition object to indicate it's privilege is the same as table
level privilege
> -------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-2013
>                 URL: https://issues.apache.org/jira/browse/HIVE-2013
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ning Zhang
>            Assignee: He Yongqiang
>
> If a query involves many partitions, checking privilege for each partition could be very
expensive. An optimization is to indicate in the partition metadata that its privilege is
the same as table level (default) privilege so that we only do 1 ACL checking for the set
of partitions having the default privilege. 

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