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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2015/04/04 09:23:33 UTC

[jira] [Created] (HIVE-10215) Large IN() clauses: deep hashCode performance during optimizer pass

Gopal V created HIVE-10215:
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             Summary: Large IN() clauses: deep hashCode performance during optimizer pass
                 Key: HIVE-10215
                 URL: https://issues.apache.org/jira/browse/HIVE-10215
             Project: Hive
          Issue Type: Bug
          Components: Logical Optimizer
            Reporter: Gopal V
            Assignee: Gopal V


The logical optimizer uses several maps and sets, which are exceeding expensive for large IN() clauses due to the fact that several part of the queries walk over the lists without short-circuiting during hashCode(), while equals() is faster due to short-circuiting via less expensive operators.



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