LinhongLiu opened a new pull request #26134: Calendarinterval URL: https://github.com/apache/spark/pull/26134 ### What changes were proposed in this pull request? Current CalendarInterval has 2 fields: months and microseconds. This PR try to change it to 3 fields: months, days and microseconds. This is because one logical day interval may have different number of microseconds (daylight saving). ### Why are the changes needed? One logical day interval may have different number of microseconds (daylight saving). For example, in PST timezone, there will be 25 hours from 2019-11-2 12:00:00 to 2019-11-3 12:00:00 ### Does this PR introduce any user-facing change? no ### How was this patch tested? unit test and new added test cases
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