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system-variables: correct the description of tidb_allow_fallback_to_tikv #7238

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Nov 18, 2021
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system-variables: correct the description of tidb_allow_fallback_to_tikv #7238

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Update system-variables.md
qiancai Sep 30, 2021
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Update system-variables.md
qiancai Oct 8, 2021
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Merge branch 'master' into pr/7238
TomShawn Nov 18, 2021
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Update system-variables.md
TomShawn Nov 18, 2021
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Expand Up @@ -258,7 +258,7 @@ mysql> SELECT * FROM t1;

- 作用域：SESSION | GLOBAL
- 默认值：""
- 这个变量表示将 TiKV 作为备用存储引擎的存储引擎列表。当该列表中的存储引擎发生故障导致 SQL 语句执行失败时，TiDB 会使用 TiKV 作为存储引擎再次执行该 SQL 语句。目前支持设置该变量为 "" 或者 "tiflash"。如果设置该变量为 "tiflash"，当 TiFlash 发生故障导致 SQL 语句执行失败时，TiDB 会使用 TiKV 作为存储引擎再次执行该 SQL 语句。
- 这个变量表示将 TiKV 作为备用存储引擎的存储引擎列表。当该列表中的存储引擎发生故障导致 SQL 语句执行失败时，TiDB 会使用 TiKV 作为存储引擎再次执行该 SQL 语句。目前支持设置该变量为 "" 或者 "tiflash"。如果设置该变量为 "tiflash"，当 TiFlash 返回超时错误（对应的错误码为 ErrTiFlashServerTimeout）时，TiDB 会使用 TiKV 作为存储引擎再次执行该 SQL 语句。

### `tidb_allow_function_for_expression_index` <span class="version-mark">从 v5.2.0 版本开始引入</span>

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