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https://issues.apache.org/jira/browse/IMPALA-7417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16602374#comment-16602374
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Csaba Ringhofer commented on IMPALA-7417:
-----------------------------------------
It turned out that the fix for IMPALA-7147 was committed with this Jira's id by
mistake. I have cloned this issue (IMPALA-7521) and changed the review to point
to the new issue to avoid confusion in the future. This issue will be probably
rewritten to be the duplicate of IMPALA-7147.
> Speed up sub-second unix time->TimestampValue conversions
> ---------------------------------------------------------
>
> Key: IMPALA-7417
> URL: https://issues.apache.org/jira/browse/IMPALA-7417
> 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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