JingsongLi 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-480660556 @KurtYoung I think that even with `RowSlidingOverFrame` and `RangeSlidingOverFrame`, still need a interface like `compare(BaseRow inputRow, int inputIndex, BaseRow currentRow, int currentIndex)` for code reuse, so I prefer to keep `BoundComparator` and not to introduce `RowXXFrame` and `RangeXXFrame`. I add the default implements `RowBoundComparator` and `RangeBoundComparator` to better understand `BoundComparator`.
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