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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (JIRA)" <ji...@apache.org> on 2018/10/05 07:28:00 UTC
[jira] [Resolved] (IMPALA-7521) CLONE - Speed up sub-second unix
time->TimestampValue conversions
[ https://issues.apache.org/jira/browse/IMPALA-7521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Csaba Ringhofer resolved IMPALA-7521.
-------------------------------------
Resolution: Implemented
> CLONE - Speed up sub-second unix time->TimestampValue conversions
> -----------------------------------------------------------------
>
> Key: IMPALA-7521
> URL: https://issues.apache.org/jira/browse/IMPALA-7521
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Csaba Ringhofer
> Assignee: Csaba Ringhofer
> Priority: Major
> Labels: performance, timestamp
>
> Currently Impala converts from sub-second unix time to TimestampValue (which is split do date_ and time_ similarly to boost::posix_time::ptime ) by first splitting the input into seconds and sub-seconds part, converting the seconds part with boost::posix_time::from_time_t(), and then adding the sub-seconds part to this timestamp. This can be done much faster by splitting the sub-second input into date_ and time_ directly.
> Avoiding boost::posix_time::from_time_t() would be also nice because it can only deal with timestamps from 1677 to 2262, which adds extra complexity to the related code.
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