belugabehr commented on pull request #2009:
URL: https://github.com/apache/hive/pull/2009#issuecomment-788939546


   @pgaref Thanks for your interest (as always).
   
   The Time parsing/formatting code is all over the place in Hive.  Did you 
know there are some areas of the code that allow for 10 digits of nanos, by 
truncating the last digit, but not others?
   
   I am trying to consolidate all that stuff and bring it into one place for 
visibility and trying to harmonize it with the pre-canned ISO formats already 
included in the JDK.  The less Hive-specific stuff regarding time handling, the 
better.  I also plan on adding copious documentation once I get the unit tests 
all working.  I know some of them are broken.  I'm having a pretty hard time 
figuring out where they are going wrong.
   
   And yes `ISO_LOCAL_TIME` includes an optional NANO field.  This will be 
mentioned in comments.


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