beliefer commented on a change in pull request #28685:
URL: https://github.com/apache/spark/pull/28685#discussion_r446591742
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowFunctionFrame.scala
##########
@@ -151,10 +168,41 @@ final class OffsetWindowFunctionFrame(
}
inputIndex += 1
}
+}
- override def currentLowerBound(): Int = throw new
UnsupportedOperationException()
+/**
+ * The fixed offset window frame calculates frames containing
+ * NTH_VALUE/FIRST_VALUE/LAST_VALUE statements.
Review comment:
I will open other PR to support first_value and last_value.
I will delete first_value and last_value temporarily, until the other PR
support them.
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