结合源码彻底讲解Aggregate vs treeAggregate

Aggregate 本文主要是讲解两个常见的聚合操作：aggregate vs treeAggregate 首先讲解aggregate，该函数的方法具体名称如下： def aggregate[U: ClassTag](zeroValue: U)(seqOp: (U, T) => U, combOp: (U, U) => U): U = withScope {  // Clone the zero

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