The cardinality represents the estimated number of rows returned from the access plan operator.
基数(cardinality)表示访问计划操作符所返回的行的估计数目。
The access plan operator is either an action that must be performed on data, or the output from a table or an index.
访问计划操作符要么是必须在数据上执行的动作，要么是表或索引的输出。
The access plan operator is either an action that must be performed on data, or the output from a table or an index.
访问计划操作符要么是必须在数据上执行的动作，要么是表或索引的输出。
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