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[WIP]: add v8.5.4 release notes #21000
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Oct 15, 2025
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Co-authored-by: JaySon <tshent@qq.com>
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Co-authored-by: Liqi Geng <gengliqiii@gmail.com>
Signed-off-by: 童剑 <1045931706@qq.com>
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Co-authored-by: hongyunyan <649330952@qq.com>
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Co-authored-by: glorv <glorvs@163.com>
...r TiKV according to glorv Co-authored-by: glorv <glorvs@163.com>
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Oct 22, 2025
releases/release-8.5.4.md
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- 将部分 TiKV 的错误日志从 ERROR 级别调整为 WARN 级别,避免产生过多不必要的告警。[#18745]([https://github.com/tikv/tikv/issues/18745](https://github.com/tikv/tikv/issues/18745))[)](https://github.com/tikv/tikv/issues/18745)) @[exit-code-1]([https://github.com/exit-code-1](https://github.com/exit-code-1))[)](https://github.com/exit-code-1))
- 将 Region MVCC 的 GC 处理逻辑改由 GC worker 线程执行,统一 GC 的处理逻辑。 [#18727]([https://github.com/tikv/tikv/issues/18727](https://github.com/tikv/tikv/issues/18727))[)](https://github.com/tikv/tikv/issues/18727)) @[v01dstar]([https://github.com/v01dstar](https://github.com/v01dstar))[)](https://github.com/v01dstar))
- 优化 gRPC 线程池线程数量默认值的计算方式,将原来的固定数据调整为根据总的 CPU 配置动态计算,避免 gRPC 线程数量太小产生的性能瓶颈。 [#18613](https://github.com/tikv/tikv/issues/18613) @[LykxSassinator](https://github.com/LykxSassinator)
- 优化 rocksdb 获取 snapshot 的性能,大幅降低在 rocksdb SST 文件数据很多场景的读写延迟。[#18743]([https://github.com/tikv/tikv/issues/18743](https://github.com/tikv/tikv/issues/18743))[)](https://github.com/tikv/tikv/issues/18743)) @[Connor1996]([https://github.com/Connor1996](https://github.com/Connor1996))[)](https://github.com/Connor1996))
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issue 号和 L46 重复了
qiancai
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Oct 22, 2025
bb7133
bb7133
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Oct 25, 2025
- 修复了 ONLY_FULL_GROUP_BY 在取值为负时可能会检查错误的问题 [#62617](https://github.com/pingcap/tidb/issues/62617) @[AilinKid](https://github.com/AilinKid)
- 修复了 ONLY_FULL_GROUP_BY 检查大小写不敏感问题 [#62672](https://github.com/pingcap/tidb/issues/62672) @[AilinKid](https://github.com/AilinKid)
- 修复 DP join order 算法可能产生的错误 plan 问题 [#63353](https://github.com/pingcap/tidb/issues/63353) @[winoros](https://github.com/winoros)
- 修复了 outer join 改写为 inner join 可能产生的错误 [#61327](https://github.com/pingcap/tidb/issues/61327) @[hawkingrei](https://github.com/hawkingrei)
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- 修复查询执行可能导致内部 panic 的问题 [#58600](https://github.com/pingcap/tidb/issues/58600) @[Defined2014](https://github.com/Defined2014)
- 修复全局索引在某些 ALTER PARTITION 状态下获取错误数据的问题 [#64084](https://github.com/pingcap/tidb/pull/64084) @[mjonss](https://github.com/mjonss)
- 修复全局索引在某些情况下返回错误结果的问题 [#61083](https://github.com/pingcap/tidb/issues/61083) @[Defined2014](https://github.com/Defined2014)
- 修复 character_set_results 在遇到错误字符时截断而不是替换的问题 [#61085](https://github.com/pingcap/tidb/issues/61085) @[xhebox](https://github.com/xhebox)
- 修复 ADD COLUMN 与 UPDATE 并发执行时的问题 [#60047](https://github.com/pingcap/tidb/issues/60047) @[L-maple](https://github.com/L-maple)
bb7133
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Oct 25, 2025
- (dup): release-9.0.0.md(beta.1) > # SQL 功能 * 支持对分区表的非唯一列创建全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014) @[mjonss](https://github.com/mjonss)
- (dup): release-9.0.0.md(beta.1) > 改进提升> TiDB - 支持由 `IN` 子查询而来的 Semi Join 使用 `semi_join_rewrite` 的 Hint [#58829](https://github.com/pingcap/tidb/issues/58829) @[qw4990](https://github.com/qw4990)
- 微调了参数 tidb_opt_ordering_index_selectivity_ratio 生效时的估算策略 [#62817](https://github.com/pingcap/tidb/issues/62817) @[terry1purcell](https://github.com/terry1purcell)
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- 支持分区表的非唯一全局索引 [#58650](https://github.com/pingcap/tidb/issues/58650) @[Defined2014](https://github.com/Defined2014)
bb7133
bb7133
reviewed
Oct 25, 2025
- 微调了 limit offset 出现在 Index Join 查询中的估算策略 [#45077](https://github.com/pingcap/tidb/issues/45077) @[qw4990](https://github.com/qw4990)
- 新增 session variable "tidb_opt_enable_no_decorrelate_in_select" 去控制 select list 中的子查询是否需要被解关联 [#51116](https://github.com/pingcap/tidb/issues/51116) @[terry1purcell](https://github.com/terry1purcell)
- 优化了 Merge join 计算 cost 可能存在遗漏 filter 的情况 [#62917](https://github.com/pingcap/tidb/issues/62917) @[qw4990](https://github.com/qw4990)
- 优化了在统计信息收集不及时情况下,越界估算的策略 [#58068](https://github.com/pingcap/tidb/issues/58068) @[terry1purcell](https://github.com/terry1purcell)
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- 在执行时间概览中添加 Backoff 时间以便调试 [#61441](https://github.com/pingcap/tidb/issues/61441) @[dbsid](https://github.com/dbsid)
- 在审计日志插件中添加语句 ID 信息 [#63525](https://github.com/pingcap/tidb/issues/63525) @[YangKeao](https://github.com/YangKeao)
- 为审计日志插件添加缓冲日志支持:[#63650](https://github.com/pingcap/tidb/issues/63650) @[bb7133](https://github.com/bb7133)
- instance.plugin_audit_log_flush_interval:刷新缓冲审计日志的时间间隔
- instance.plugin_audit_log_buffer_size:插件审计日志的缓冲区大小(字节),默认值为 0(不使用缓冲)
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