Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21505#discussion_r194299485
--- 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 --
Yes, it should work functionally if we check a given time zone every time.
Do you know the typical access pattern of time zone? If there is temporal
locality regarding time zone, we do not have to use `mutale.Map`.
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