beliefer commented on a change in pull request #28685:
URL: https://github.com/apache/spark/pull/28685#discussion_r470375984
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
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@@ -474,6 +479,55 @@ case class Lag(input: Expression, offset: Expression,
default: Expression)
override val direction = Descending
}
+/**
+ * The NthValue function returns the value of `input` at the row that is the
`offset`th row of
+ * the window frame (counting from 1). Offsets start at 0, which is the
current row. When the
Review comment:
Sorry! I made a mistake.
`Offsets start at 1`
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