KurtYoung commented on issue #8102: [FLINK-12087][table-runtime-blink] Introduce over window operators to blink batch URL: https://github.com/apache/flink/pull/8102#issuecomment-480699105 I think the problem is the methods you proposed: `isLeftBoundRowInWindow` and `isRightBoundRowInWindow`. In `RowSlidingOverFrame`, there is no need to iterate rows preceding and following, and check whether it belongs to current frame one by one. As I said before, you can immediately determine the left and right boundary with `currentIndex - precedingCount, currentIndex + followingCount`
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