JingsongLi edited a comment on issue #8102: [FLINK-12087][table-runtime-blink] Introduce over window operators to blink batch URL: https://github.com/apache/flink/pull/8102#issuecomment-480702530 >> As I said before, you can immediately determine the left and right boundary with currentIndex - precedingCount, currentIndex + followingCount I think we don't need this optimization now. In `RowSlidingFrame`, we don't need immediately determine boundary. Because it must be head boundary plus 1 and end boundary plus 1, Even if change to immediately determine boundary. The algorithm complexity is the same. See more detail in `SlidingOverFrame.process`, next current row computation will reuse previous buffer.
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