cloud-fan commented on a change in pull request #27830: [SPARK-31030][SQL]
Backward Compatibility for Parsing and formatting Datetime
URL: https://github.com/apache/spark/pull/27830#discussion_r390228108
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
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@@ -906,4 +906,45 @@ object DateTimeUtils {
val days = period.getDays
new CalendarInterval(months, days, 0)
}
+
+ /**
+ * Since the Proleptic Gregorian calendar is de-facto calendar worldwide, as
well as the chosen
Review comment:
In Spark 3.0, we switch to the Proleptic Gregorian calendar and use
`DateTimeFormatter` for parsing/formatting datetime values. The pattern string
is incompatible with the one defined by `SimpleDateFormat` in Spark 2.4 and
earlier. This function ...
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