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https://issues.apache.org/jira/browse/IMPALA-7521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Csaba Ringhofer updated IMPALA-7521:
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Fix Version/s: Impala 3.1.0
> 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
> Fix For: Impala 3.1.0
>
>
> 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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