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release-5.1.0.md: add compatibility change for tidb_enable_noop_functions #6870

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release-5.1.0.md: add compatibility change for tidb_enable_noop_functions #6870

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Update release-5.1.0.md
qiancai Aug 16, 2021
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Expand Up @@ -63,6 +63,7 @@ TiDB 版本：5.1
- 请避免在 TiDB 滚动升级时执行 `alter table ... modify column` 或 `alter table ... change column`。
- 当按表构建 TiFlash 副本时，v5.1 版本及后续版本将不再支持设置系统表的 replica。在集群升级前，需要清除相关系统表的 replica，否则会导致升级失败。
- 在 TiCDC 的 `cdc cli changefeed` 命令中废弃 `--sort-dir` 参数，用户可在 `cdc server` 命令中设定 `--sort-dir`。[#1795](https://github.com/pingcap/ticdc/pull/1795)
- 升级到 TiDB 5.1 之后，如果遇到 "function READ ONLY has only noop implementation" 错误，可以将系统变量 [`tidb_enable_noop_functions`](/system-variables.md#tidb_enable_noop_functions-从-v40-版本开始引入) 的值设置为 `ON` 以忽略此报错。因为 MySQL 的 ‘read_only’ 变量在 TiDB 中尚不生效（属于 ‘noop’ 行为），即使在 TiDB 中设置了此变量，集群仍然是可写的。
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## 新功能

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