Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/21505#discussion_r194268734 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala --- @@ -111,6 +113,23 @@ object DateTimeUtils { computedTimeZones.computeIfAbsent(timeZoneId, computeTimeZone) } + private val threadLocalComputedCalendarsMap = + new ThreadLocal[mutable.Map[TimeZone, Calendar]] { --- End diff -- Usually, only the default time zone is used. To execute `Cast` regarding date is called with a timezone may use another timezone. For the correctness, I think that it is necessary to support multiple timezones. To enable caching for default time zone and to create an instance for other time zones would also work correctly.
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