[jira] [Created] (IMPALA-7521) CLONE - Speed up sub-second unix time->TimestampValue conversions

["Csaba Ringhofer (JIRA)" <ji...@apache.org>]

Csaba Ringhofer created IMPALA-7521:
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             Summary: 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


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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