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-480671767 > Why `RowSlidingOverFrame` needs a comparator class? consider sql: `order by c range Unbounded PRECEDING and CURRENT ROW` The end bound of this frame is range current row, that mean `inputRow` less than or equal to `currentRow` should be included in the window. So the comparator do this comparison.
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