The indexed columns have low cardinality, that is, the number of distinct values is small compared to the number of table rows.
索引列有较低的相似度，这就意味着，在表的记录中相同值的数据的数量比较少。
The indexed columns have low cardinality, that is, the number of distinct values is small compared to the number of table rows.
索引列有较低的相似度，这就意味着，在表的记录中相同值的数据的数量比较少。
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