Principle of aggregation logic

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I want to use aggregation logic to implement some copy map playing methods, add a main map to let 30 players join, and then divide the players into different small copies, so that the number of players can be controlled when managing small copies, and it can also avoid the performance degradation of the map caused by too many things on a map. What are the tutorials you can refer to, I have seen the official explanation of the use of aggregation, but I feel that the detailed principle of the operation of aggregation logic is still unclear. Can you help me?