beliefer commented on a change in pull request #28685:
URL: https://github.com/apache/spark/pull/28685#discussion_r476307262



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
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@@ -352,17 +353,24 @@ abstract class OffsetWindowFunction
   val default: Expression
 
   /**
-   * (Foldable) expression that contains the number of rows between the 
current row and the row
-   * where the input expression is evaluated.
+   * (Foldable) expression that contains the number of rows between the 
current row or the first

Review comment:
       OK




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