[jira] [Assigned] (HIVE-7090) Support session-level temporary tables in Hive

["Jason Dere (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason Dere reassigned HIVE-7090:
--------------------------------

    Assignee: Jason Dere  (was: Harish Butani)

> Support session-level temporary tables in Hive
> ----------------------------------------------
>
>                 Key: HIVE-7090
>                 URL: https://issues.apache.org/jira/browse/HIVE-7090
>             Project: Hive
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Gunther Hagleitner
>            Assignee: Jason Dere
>         Attachments: HIVE-7090.1.patch, HIVE-7090.2.patch, HIVE-7090.3.patch
>
>
> It's common to see sql scripts that create some temporary table as an intermediate result, run some additional queries against it and then clean up at the end.
> We should support temporary tables properly, meaning automatically manage the life cycle and make sure the visibility is restricted to the creating connection/session. Without these it's common to see left over tables in meta-store or weird errors with clashing tmp table names.
> Proposed syntax:
> CREATE TEMPORARY TABLE ....
> CTAS, CTL, INSERT INTO, should all be supported as usual.
> Knowing that a user wants a temp table can enable us to further optimize access to it. E.g.: temp tables should be kept in memory where possible, compactions and merging table files aren't required, ...



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