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release-notes: add 5.2.1 release notes (pingcap#7086)
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title: TiDB 5.2.1 Release Notes | ||
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# TiDB 5.2.1 Release Notes | ||
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发版日期:2021 年 9 月 9 日 | ||
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TiDB 版本:5.2.1 | ||
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## Bug 修复 | ||
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+ TiDB | ||
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- 修复在分区中下推聚合算子时,因浅拷贝 schema 列导致执行计划出错,进而导致执行时报错的问题 [#27797](https://github.com/pingcap/tidb/issues/27797) [#26554](https://github.com/pingcap/tidb/issues/26554) | ||
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+ TiKV | ||
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- 修复 Region 迁移时 Raftstore 模块出现死锁导致 TiKV 不可用的问题。用户可通过关闭调度并重启出问题的 TiKV 来临时应对。[#10909](https://github.com/tikv/tikv/issues/10909) |
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