beliefer commented on a change in pull request #30387:
URL: https://github.com/apache/spark/pull/30387#discussion_r527569444



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExecBase.scala
##########
@@ -136,8 +136,8 @@ trait WindowExecBase extends UnaryExecNode {
           val frame = 
spec.frameSpecification.asInstanceOf[SpecifiedWindowFrame]
           function match {
             case AggregateExpression(f, _, _, _, _) => collect("AGGREGATE", 
frame, e, f)
-            case f: FrameLessOffsetWindowFunction =>
-              collect("FRAME_LESS_OFFSET", f.fakeFrame, e, f)
+            case f: FrameLessOffsetWindowFunction => collect(
+              s"FRAME_LESS_OFFSET_${f.ignoreNulls}_${f.input.prettyName}", 
f.fakeFrame, e, f)

Review comment:
       Can't distinguish input completely according to index. Different window 
function may use the same input.




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