cloud-fan commented on a change in pull request #28787:
URL: https://github.com/apache/spark/pull/28787#discussion_r438550078
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/RebaseDateTime.scala
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@@ -326,20 +326,34 @@ object RebaseDateTime {
*/
private[sql] def rebaseGregorianToJulianMicros(zoneId: ZoneId, micros:
Long): Long = {
val instant = microsToInstant(micros)
- var ldt = instant.atZone(zoneId).toLocalDateTime
+ val zonedDateTime = instant.atZone(zoneId)
+ var ldt = zonedDateTime.toLocalDateTime
if (ldt.isAfter(julianEndTs) && ldt.isBefore(gregorianStartTs)) {
ldt = LocalDateTime.of(gregorianStartDate, ldt.toLocalTime)
}
val cal = new Calendar.Builder()
- // `gregory` is a hybrid calendar that supports both
- // the Julian and Gregorian calendar systems
+ // `gregory` is a hybrid calendar that supports both the Julian and
Gregorian calendar systems
.setCalendarType("gregory")
.setDate(ldt.getYear, ldt.getMonthValue - 1, ldt.getDayOfMonth)
.setTimeOfDay(ldt.getHour, ldt.getMinute, ldt.getSecond)
- // Local time-line can overlaps, such as at an autumn daylight savings
cutover.
- // This setting selects the original local timestamp mapped to the given
`micros`.
- .set(Calendar.DST_OFFSET,
zoneId.getRules.getDaylightSavings(instant).toMillis.toInt)
.build()
+ // A local timestamp can have 2 instants in the cases of switching from:
+ // 1. Summer to winter time.
+ // 2. One standard time zone to another one. For example, Asia/Hong_Kong
switched from JST
+ // to HKT on 18 November, 1945 01:59:59 AM.
+ // Below we check that the original `instant` is earlier or later instant.
If it is an earlier
+ // instant, we take the standard and DST offsets of the previous day
otherwise of the next one.
+ val trans = zoneId.getRules.getTransition(ldt)
+ if (trans != null && trans.isOverlap) {
Review comment:
when will we go into this expensive branch?
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