If an object will be looked up by two or more keys, the most reasonable key that you partition by would be the most commonly used key.
如果根据两个或多个键查询一个对象，进行分区所依据的最合理的键将是最常用的键。
The grouping operation is based on one or more keys.
分组操作基于一个或多个键。
The grouping operation is based on one or more keys.
分组操作基于一个或多个键。
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