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

["Gunther Hagleitner (JIRA)" <ji...@apache.org>]

Gunther Hagleitner created HIVE-7090:
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             Summary: 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


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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