Github user carsonwang commented on a diff in the pull request: https://github.com/apache/spark/pull/11071#discussion_r51972422 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala --- @@ -55,10 +56,19 @@ object DateTimeUtils { // this is year -17999, calculation: 50 * daysIn400Year final val YearZero = -17999 final val toYearZero = to2001 + 7304850 - final val TimeZoneGMT = TimeZone.getTimeZone("GMT") @transient lazy val defaultTimeZone = TimeZone.getDefault + // Reuse the TimeZone object as it is expensive to create in each method call. + final val timeZones = new ConcurrentHashMap[String, TimeZone] --- End diff -- Added `transient`. The total available timezone IDs should be limited.
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