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-480671968 > Why `RowSlidingOverFrame` needs a comparator class? Don't need a comparator class, but need a compare method to reuse code in `BaseSlidingOverFrame`.
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