爲什麼未覆蓋hashcode方法的pojo不能用作flink keyedstream的key

通過查看KeySelector代碼可以發現，key需要滿足的基礎條件爲： The {@link KeySelector} allows to use deterministic objects for operations such as reduce, reduceGroup, join, coGroup, etc. If invoked multiple times on the same o

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