[GitHub] [spark] beliefer commented on a change in pull request #27440: [SPARK-27951][SQL] Support ANSI SQL NTH_VALUE window function

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beliefer commented on a change in pull request #27440: [SPARK-27951][SQL] Support ANSI SQL NTH_VALUE window function
URL: https://github.com/apache/spark/pull/27440#discussion_r376879241
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
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 @@ -363,6 +363,11 @@ abstract class OffsetWindowFunction
    */
   val direction: SortDirection
 
+  /**
+   * Whether the offset is based on the entire frame.
+   */
+  val isWholeBased: Boolean = false
 
 Review comment:
   I want `NTH_VALUE/FIRST_VALUE/LAST_VALUE` use this.

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