cloud-fan commented on issue #26134: [SPARK-29486][SQL] CalendarInterval should have 3 fields: months, days and microseconds URL: https://github.com/apache/spark/pull/26134#issuecomment-542619529 one day is always 24 hours, but one day interval may not. Daylight saving doesn't change the # of hours in a day, but the timezone offset of a region. For example, California is in UTC-7 right now, but will be in UTC-8 after 3 Nov 2019. So adding one day to `3 Nov 2019` at local time maybe different from adding 24 hours. However, I'd like to know if it's allowed to set timezone to a region name that has undetermined timezone offset. If it's not allowed then one day interval is always 24 hours in SQL.
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