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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2023/05/08 14:36:00 UTC

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

     [ https://issues.apache.org/jira/browse/IMPALA-12111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Csaba Ringhofer resolved IMPALA-12111.
--------------------------------------
    Fix Version/s: Impala 4.3.0
       Resolution: Fixed

> 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
>            Priority: Major
>             Fix For: Impala 4.3.0
>
>
> 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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