Github user sunjincheng121 commented on a diff in the pull request:
https://github.com/apache/flink/pull/3574#discussion_r107066745
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/AggregateUtil.scala
---
@@ -89,6 +95,18 @@ object AggregateUtil {
aggregationStateType)
}
}
+
+ def getLowerBoundary(
+ constants: ImmutableList[RexLiteral],
+ lowerBound: RexWindowBound,
+ input: RelNode): Int = {
+ val ref: RexInputRef = lowerBound.getOffset.asInstanceOf[RexInputRef]
+ val index:Int = ref.getIndex
+ val count: Int = input.getRowType.getFieldCount
--- End diff --
Can you explain more why we using `input.getRowType.getFieldCount` to
calculation the LowerBoundary?
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