cloud-fan commented on a change in pull request #30023:
URL: https://github.com/apache/spark/pull/30023#discussion_r503762036
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
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@@ -348,16 +348,12 @@ abstract class OffsetWindowFunction
/**
* (Foldable) expression that contains the number of rows between the
current row and the row
- * where the input expression is evaluated.
+ * where the input expression is evaluated. If `offset` is a positive
integer, it means that
+ * the direction of the `offset` is from front to back. If it is a negative
integer, the direction
+ * of the `offset` is from back to front.
Review comment:
what if the offset is 0?
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