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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-16182) Semijoin: Avoid VectorHashKeyWrapper allocations for the bloom hash aggregate
Date Sat, 11 Mar 2017 19:20:04 GMT
Gopal V created HIVE-16182:
------------------------------

             Summary: Semijoin: Avoid VectorHashKeyWrapper allocations for the bloom hash
aggregate
                 Key: HIVE-16182
                 URL: https://issues.apache.org/jira/browse/HIVE-16182
             Project: Hive
          Issue Type: Improvement
          Components: Vectorization
    Affects Versions: 2.2.0
            Reporter: Gopal V


To avoid GC spam during the hash aggregate part of the bloom filter, the key for the semijoin
can be special-cased as an immutable empty key.





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