beliefer commented on a change in pull request #29604:
URL: https://github.com/apache/spark/pull/29604#discussion_r490664576
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
##########
@@ -549,6 +549,81 @@ case class CumeDist() extends RowNumberLike with
SizeBasedWindowFunction {
override def prettyName: String = "cume_dist"
}
+@ExpressionDescription(
+ usage = """
+ _FUNC_(input[, offset]) - Returns the value of `input` at the row that is
the `offset`th row
+ from beginning of the window frame. Offsets start at 1. If
ignoreNulls=true, we will skip
+ nulls when finding the `offset`th row. Otherwise, every row counts for
the `offset`. If
+ there is no such an offset row (e.g., when the offset is 10, size of the
window frame less
+ than 10), null is returned.
Review comment:
OK
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