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From "Patrick Angeles (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2316) MapJoin optimizer can make the wrong decision on compressed tables
Date Wed, 27 Jul 2011 18:58:09 GMT
MapJoin optimizer can make the wrong decision on compressed tables
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                 Key: HIVE-2316
                 URL: https://issues.apache.org/jira/browse/HIVE-2316
             Project: Hive
          Issue Type: Bug
            Reporter: Patrick Angeles


With hive.auto.convert.join = true, it appears that when the small tables are compressed,
the optimizer cannot properly guess the size of the in-memory tables. It proceeds with a MapJoin
based on the compressed size, instead of falling back to a CommonJoin.

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