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release note: add a check item for feedback-probability (#6887) (#7022)
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ti-chi-bot authored Aug 30, 2021
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Expand Up @@ -63,6 +63,7 @@ TiDB 版本:5.0.0

### 其他

+ 升级前,请检查 TiDB 配置项 [`feedback-probability`](/tidb-configuration-file.md#feedback-probability) 的值。如果不为 0,升级后会触发 "panic in the recoverable goroutine" 报错,但不影响升级。
+ 为了避免造成数据正确性问题,列类型变更不再允许 `VARCHAR` 类型和 `CHAR` 类型的互相转换。

## 新功能
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