cloud-fan commented on a change in pull request #28685:
URL: https://github.com/apache/spark/pull/28685#discussion_r476289523
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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 +168,46 @@ final class OffsetWindowFunctionFrame(
}
inputIndex += 1
}
+}
- override def currentLowerBound(): Int = throw new
UnsupportedOperationException()
+/**
+ * The absolute offset window frame based on the first row calculates frames
containing
+ * NTH_VALUE statements. The absolute offset window frame based on the first
row return
+ * the same value for all rows in the window partition.
Review comment:
> the first row return the same value for all rows in the window
partition.
what does it mean?
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