类分层结构
- java.lang.Object
- org.apache.flink.streaming.api.functions.aggregation.AggregationFunction<T> (implements org.apache.flink.api.common.functions.ReduceFunction<T>)
- org.apache.flink.streaming.api.functions.aggregation.Comparator (implements java.io.Serializable)
- org.apache.flink.streaming.api.functions.aggregation.SumFunction (implements java.io.Serializable)
枚举分层结构
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