cloud-fan commented on a change in pull request #29800:
URL: https://github.com/apache/spark/pull/29800#discussion_r511922381



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File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowFunctionFrame.scala
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@@ -151,10 +169,69 @@ final class OffsetWindowFunctionFrame(
     }
     inputIndex += 1

Review comment:
       here we reset the `inputIndex`. Does it make sense for nth_value?




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