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partitioning: Corrected partition management (#6837) #7082

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partitioning: Corrected partition management (#6837) #7082

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partitioning: Corrected partition management
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Expand Up @@ -572,7 +572,21 @@ Empty set (0.00 sec)

## 分区管理

通过 `ALTER TABLE` 语句可以执行一些添加、删除、合并、切分、重定义分区的操作。
对于 `LIST` 和 `RANGE` 分区表，通过 `ALTER TABLE <表名> ADD PARTITION (<分区说明>)` 或 `ALTER TABLE <表名> DROP PARTITION <分区列表>` 语句，可以执行添加和删除分区的操作。

对于 `LIST` 和 `RANGE` 分区表，暂不支持 `REORGANIZE PARTITION` 语句。

对于 `HASH` 分区表，暂不支持 `COALESCE PARTITION` 和 `ADD PARTITION` 语句。

`EXCHANGE PARTITION` 语句用来交换分区和非分区表，类似于重命名表如 `RENAME TABLE t1 TO t1_tmp, t2 TO t1, t1_tmp TO t2` 的操作。

例如，`ALTER TABLE partitioned_table EXCHANGE PARTITION p1 WITH TABLE non_partitioned_table` 交换的是 `p1` 分区的 `non_partitioned_table` 表和 `partitioned_table` 表。

确保要交换入分区中的所有行与分区定义匹配；否则，你将无法找到这些行，并导致意外情况出现。

> **警告：**
>
> `EXCHANGE PARTITION` 是实验性功能，不建议在生产环境中使用。要启用 `EXCHANGE PARTITION`，将系统变量 `tidb_enable_exchange_partition` 设置为 `ON`。

### Range 分区管理

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