问Flux.groupBy的好处是什么？还是列表分区？

EN

    @Test
    fun groupByTwoLists() {
        val numbers = (0..9).toList()

        Flux.fromIterable(numbers)
            .groupBy<Boolean> { it % 2 == 0 }
            .flatMap { group: GroupedFlux<Boolean, Int> ->
                if (group.key() == true) {
                    group.collectList().doOnNext { println("We are even") }
                } else {
                    group.collectList().doOnNext { println("We are odd") }
                }
            }
            .test()
            .expectNextCount(2)
            .verifyComplete()
    }

    @Test
    fun partitionLists() {
        val numbers = (0..9).toList()
        val (even, odd) = numbers.partition { it % 2 == 0 }

        val monoEven = Mono.just(even).doOnNext { println("We are even") }
        val monoOdd = Mono.just(odd).doOnNext { println("We are odd") }

        Flux.merge(monoEven, monoOdd)
            .test()
            .expectNextCount(2)
            .verifyComplete()
    }