Xuefu Zhang commented on HIVE-18513:

That's good. As a minor comment, if we were only doing time-based invalidation, 
there wouldn't be much a different between internal table and external table.

> Query results caching
> ---------------------
>                 Key: HIVE-18513
>                 URL: https://issues.apache.org/jira/browse/HIVE-18513
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Planning
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>            Priority: Major
>         Attachments: HIVE-18513.1.patch, HIVE-18513.2.patch, 
> HIVE-18513.3.patch, HIVE-18513.4.patch, HIVE-18513.5.patch
> Add a query results cache that can save the results of an executed Hive query 
> for reuse on subsequent queries. This may be useful in cases where the same 
> query is issued many times, since Hive can return back the results of a 
> cached query rather than having to execute the full query on the cluster.

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