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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