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docs:Add tidb_opt_force_inline_cte system vars usage description in docs. #11216

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Sep 17, 2022
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docs:Add tidb_opt_force_inline_cte system vars usage description in docs. #11216

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docs:Add tidb_opt_inline_cte system vars usage description in docs.
elsa0520 Sep 5, 2022
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Merge branch 'variable' of github.com:elsa0520/docs-cn into variable
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8 changes: 8 additions & 0 deletions system-variables.md
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Expand Up @@ -1832,6 +1832,14 @@ explain select * from t where age=5;
- 默认值：`OFF`
- 这个变量用来设置是否允许 `INSERT`、`REPLACE` 和 `UPDATE` 操作 `_tidb_rowid` 列，默认是不允许操作。该选项仅用于 TiDB 工具导数据时使用。

### `tidb_opt_force_inline_cte` <span class="version-mark">从 v6.3.0 版本开始引入</span>

- 作用域：SESSION | GLOBAL
- 是否持久化到集群：是
- 类型：布尔型
- 默认值：`OFF`
- 这个变量用来控制是否强制 inline CTE。默认值为 `OFF`，即默认不强制 inline CTE。注意，此时依旧可以通过 `MERGE()` hint 来开启个别 CTE 的 inline。如果设置为 `ON`，则当前 session 中所有查询的 CTE（递归 CTE 除外）都会 inline。

### `tidb_partition_prune_mode` <span class="version-mark">从 v5.1 版本开始引入</span>

- 作用域：SESSION | GLOBAL
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