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sys-var: add 2 for mpp_version (#19014) #19017

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Nov 6, 2024
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sys-var: add 2 for mpp_version (#19014) #19017

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61051c8
Update mpp version description
yibin87 Nov 6, 2024
b1a7942
Update system-variables.md
hfxsd Nov 6, 2024
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5 changes: 3 additions & 2 deletions system-variables.md
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Expand Up @@ -694,11 +694,12 @@ mysql> SHOW GLOBAL VARIABLES LIKE 'max_prepared_stmt_count';
- 是否持久化到集群：是
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制：是
- 默认值：`UNSPECIFIED`
- 可选值：`UNSPECIFIED`，`0`，`1`
- 可选值：`UNSPECIFIED`，`0`，`1`，`2`
- 该变量用于指定不同版本的 MPP 执行计划。指定后，TiDB 会选择指定版本的 MPP 执行计划。该变量值含义如下：
- `UNSPECIFIED`：表示未指定，此时 TiDB 自动选择最新版本 `1`。
- `UNSPECIFIED`：表示未指定，此时 TiDB 自动选择最新版本 `2`。
- `0`：兼容所有 TiDB 集群版本，MPP 版本大于 `0` 的新特性均不会生效。
- `1`：从 v6.6.0 版本开始引入，用于开启 TiFlash 带压缩的数据交换，详情参见 [MPP Version 和 Exchange 数据压缩](/explain-mpp.md#mpp-version-和-exchange-数据压缩)。
- `2`：从 v7.3.0 版本开始引入，用于确保在 TiFlash 执行出错的情况下，获取到准确的报错信息。

### `password_history` <span class="version-mark">从 v6.5.0 版本开始引入</span>

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