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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2015/07/30 01:39:04 UTC

[jira] [Created] (HIVE-11406) Vectorization: StringExpr::compare() == 0 is bad for performance

Gopal V created HIVE-11406:
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             Summary: Vectorization: StringExpr::compare() == 0 is bad for performance
                 Key: HIVE-11406
                 URL: https://issues.apache.org/jira/browse/HIVE-11406
             Project: Hive
          Issue Type: Bug
          Components: Vectorization
    Affects Versions: 1.3.0, 2.0.0
            Reporter: Gopal V
            Assignee: Gopal V


{{StringExpr::compare() == 0}} is forced to evaluate the whole memory comparison loop for differing lengths of strings, though there is no possibility they will ever be equal.

Add a {{StringExpr::equals}} which can be a smaller and tighter loop.



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