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Posted to issues@impala.apache.org by "Taras Bobrovytsky (JIRA)" <ji...@apache.org> on 2017/12/14 01:02:18 UTC

[jira] [Created] (IMPALA-6320) It may be possible to speed up decimal comparison by counting leading zeros in the underlying data type

Taras Bobrovytsky created IMPALA-6320:
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             Summary: It may be possible to speed up decimal comparison by counting leading zeros in the underlying data type
                 Key: IMPALA-6320
                 URL: https://issues.apache.org/jira/browse/IMPALA-6320
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
    Affects Versions: Impala 2.11.0
            Reporter: Taras Bobrovytsky
            Assignee: Taras Bobrovytsky


Decimal comparison may be slower than it needs to be because we are using larger datatypes than we need all the time. We should investigate if it's possible to speed up decimal comparison by first checking if the larger data type is needed by counting leading zeros.



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