Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21505#discussion_r194848108 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala --- @@ -111,6 +113,22 @@ object DateTimeUtils { computedTimeZones.computeIfAbsent(timeZoneId, computeTimeZone) } + private val threadLocalComputedCalendarsMap = + new ThreadLocal[mutable.Map[TimeZone, Calendar]] { + override def initialValue(): mutable.Map[TimeZone, Calendar] = { + mutable.Map[TimeZone, Calendar]() + } + } + + def getCalendar(timeZone: TimeZone): Calendar = { + val c = threadLocalComputedCalendarsMap.get() + .getOrElseUpdate(timeZone, { --- End diff -- nit: `getOrElseUpdate(timeZone, Calendar.getInstance(timeZone))`
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