beliefer commented on a change in pull request #29800:
URL: https://github.com/apache/spark/pull/29800#discussion_r512376471
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
##########
@@ -355,6 +344,35 @@ abstract class OffsetWindowFunction
*/
val offset: Expression
+ /**
+ * Default result value for the function when the `offset`th row does not
exist.
+ */
+ val default: Expression
+
+ /**
+ * An optional specification that indicates the offset window function
should skip null values in
+ * the determination of which row to use.
+ */
+ val ignoreNulls: Boolean
+
+ /**
+ * Whether the offset is starts with the current row. If `isRelative` is
true, `offset` means
+ * the offset is start with the current row. otherwise, the offset is starts
with the first
+ * row of the entire window frame.
+ */
+ val isRelative: Boolean
+
+ lazy val fakeFrame = SpecifiedWindowFrame(RowFrame, offset, offset)
+}
+
+/**
+ * An offset window function is a window function that returns the value of
the input column offset
Review comment:
OK
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