beliefer commented on code in PR #50552:
URL: https://github.com/apache/spark/pull/50552#discussion_r2039271225
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sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowFunctionFrame.scala:
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@@ -183,7 +183,8 @@ abstract class OffsetWindowFunctionFrameBase(
override def prepare(rows: ExternalAppendOnlyUnsafeRowArray): Unit = {
resetStates(rows)
if (absOffset > rows.length) {
- fillDefaultValue(EmptyRow)
Review Comment:
And I think it's not related to the partition size.
The cause is apply expression on empty row.
We can check the default expression and apply `fillDefaultValue(currentRow)`
in write if it is not a Literal, or apply it is in prepare if it is a literal.
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