Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/21008
> HIVE-15978 introduced the roundOff flag in order to disable the rounding
to 8 digits which is performed in months_between. Since this can be a
computational intensive operation, skipping it may improve performances when
the rounding is not needed.
The PR number is HIVE-15511
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