Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19250#discussion_r143272791
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
---
@@ -1213,6 +1213,71 @@ case class ToUTCTimestamp(left: Expression, right:
Expression)
}
/**
+ * This modifies a timestamp to show how the display time changes going
from one timezone to
+ * another, for the same instant in time.
+ *
+ * We intentionally do not provide an ExpressionDescription as this is not
meant to be exposed to
+ * users, its only used for internal conversions.
+ */
+private[spark] case class TimestampTimezoneCorrection(
--- End diff --
> Additionally, timezone rules have changed over time and keep changing.
Ah, yes, that makes sense... it's also why my initial tests were failing at
the DST boundaries. :-/
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