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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