Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/14284#discussion_r71489063
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/WindowExec.scala ---
@@ -582,25 +582,43 @@ private[execution] final class
OffsetWindowFunctionFrame(
/** Row used to combine the offset and the current row. */
private[this] val join = new JoinedRow
- /** Create the projection. */
+ /**
+ * Create the projection used when the offset row exists.
+ * Please note that this project always respect null input values (like
PostgreSQL).
+ */
private[this] val projection = {
--- End diff --
If we want to keep the behavioral change, we can make this the same as the
original `project` and revert
https://github.com/apache/spark/pull/14284/files#diff-4a8f00ca33a80744965463dcc6662c75R351.
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