13,删除索引分区(Dropping Index Partitions) 和上面是相对的，有增就有删
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删除索引分区
Delete the index partition
以上为机器翻译结果，长、整句建议使用 人工翻译 。
那意味着，无论何时添加或删除分区，都必须在分区表的所有现有索引中添加或删除对应记录。
This meant that whenever partitions were added or removed, corresponding records had to be added to or removed from any indexes that existed for the table.
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