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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