Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21225#discussion_r185840475
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExec.scala
---
@@ -197,6 +198,7 @@ case class WindowExec(
// Map the groups to a (unbound) expression and frame factory pair.
var numExpressions = 0
+ val timeZone = conf.sessionLocalTimeZone
--- End diff --
that one is OK because it's not in a closure and passed to executors.
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