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https://issues.apache.org/jira/browse/HIVE-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14002492#comment-14002492
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Gunther Hagleitner commented on HIVE-7090:
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Implementation:
Idea is simple:
- Keep metadata for tmp table in memory tied to the SessionState (will result
in the right visibility of the table)
- Set location of tables to use the session scratch dir (automatic cleanup when
session is closed)
> Support session-level temporary tables in Hive
> ----------------------------------------------
>
> Key: HIVE-7090
> URL: https://issues.apache.org/jira/browse/HIVE-7090
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Harish Butani
>
> 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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