imply-cheddar opened a new pull request, #14530:
URL: https://github.com/apache/druid/pull/14530

   UniformGranularityTest's tes to test a large number of intervals runs 
through 10 years of 1 second intervals.  This pushes a lot of stuff through 
IntervalIterator and shows up in terms of test runtime as one of the hottest 
tests.  Most of the time is going to constructing jodatime objects because it 
is doing things with DateTime objects instead of millis.  Change the calls to 
use millis instead and things go faster.
   
   This is a flamegraph of the CPU usage of this test
   
   <img width="1942" alt="image" 
src="https://github.com/apache/druid/assets/86940447/464fe17d-bcc2-4bc2-93a3-778925adf037";>
   


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