beliefer commented on a change in pull request #28685:
URL: https://github.com/apache/spark/pull/28685#discussion_r476090110
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
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@@ -474,6 +480,54 @@ case class Lag(input: Expression, offset: Expression,
default: Expression)
override val direction = Descending
}
+/**
+ * The NthValue function returns the value of `input` at the `offset`th row
from beginning of the
+ * window frame. Offsets start at 1. When the value of `input` is null at the
`offset`th row or
Review comment:
OK
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