Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17933#discussion_r116377714
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -98,6 +99,14 @@ object DateTimeUtils {
sdf
}
+ private val threadLocalTimeZones = new ThreadLocal[mutable.Map[String,
TimeZone]] {
--- End diff --
As we won't go to update this map. We only need synchronization when
putting the values. The content of the map can be shared between threads when
reading. I am wondering if we need a local map for each thread.
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