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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2023/05/02 08:53:00 UTC

[jira] [Created] (IMPALA-12111) Speed up DATE to STRING conversion

Csaba Ringhofer created IMPALA-12111:
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             Summary: Speed up DATE to STRING conversion
                 Key: IMPALA-12111
                 URL: https://issues.apache.org/jira/browse/IMPALA-12111
             Project: IMPALA
          Issue Type: Improvement
          Components: be
            Reporter: Csaba Ringhofer


Converting DATE to STRING is slower than converting TIMESTAMP to STRING which is weird as TIMESTAMP handling should need more work. The culprit seems to be using stringstream in DateValue.ToString(): https://github.com/apache/impala/blob/14698c8b99b80db7e6fd99900e32b6742bef1662/be/src/runtime/date-value.cc#L433

As dates are returned as string to the client this also slow down the materialization of results on the coordinator.



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