However, if there are many duplicate rows per distinct index value, and the associated table is highly clustered, the added costs of joining through the index can be slight.
然而，如果每个不同的索引值都有许多重复的行，而所关联的表是高度群集的，那么通过索引添加的连接成本可能很低。
The index exploited for the inner table happens to be a clustered index.
利用内部表的索引恰好是一个聚集索引。
The replay position advancement is necessary because the slow alter, alter fragment, and clustered index creation operations change the table partition Numbers.
重放位置的推进是必需的，因为slow alter、alter fragment和集群索引创建操作会改变表分区号。
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