Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18540#discussion_r125900833
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/WindowSpec.scala ---
@@ -174,28 +191,22 @@ class WindowSpec private[sql](
*/
// Note: when updating the doc for this method, also update
Window.rangeBetween.
def rangeBetween(start: Long, end: Long): WindowSpec = {
--- End diff --
Maybe we can use `Literal(0)` to represent `CurrentRow`? And a sufficient
large number(like `Literal(Long.MaxValue)`) for `Unbounded`?
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