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