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update improvements > TiDB and bug fixes > BR, TiDB Lightning
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Signed-off-by: Aolin <[email protected]>
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Oreoxmt committed Oct 14, 2024
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25 changes: 12 additions & 13 deletions releases/release-8.4.0.md
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- Support Index Join by default when the inner table has `Selection`, `Projection`, or `Aggregation` operators on it [#47233](https://github.com/pingcap/tidb/issues/47233) @[winoros](https://github.com/winoros) **tw@Oreoxmt** <!--1709-->
- Reduce the number of column details fetched from TiKV for `DELETE` operations in certain scenarios, lowering the resource overhead of these operations [#38911](https://github.com/pingcap/tidb/issues/38911) @[winoros](https://github.com/winoros) **tw@Oreoxmt** <!--1798-->
- Support setting the concurrency within a single automatic statistics collection task using the system variable `tidb_auto_analyze_concurrency` [#53460](https://github.com/pingcap/tidb/issues/53460) @[hawkingrei](https://github.com/hawkingrei) **tw@Oreoxmt** <!--1739-->
- 优化一处内部函数逻辑,提升查询列数特别多的表时的性能 [#52112](https://github.com/pingcap/tidb/issues/52112) @[Rustin170506](https://github.com/Rustin170506)
- 支持将形如 `a = 1 AND (a > 1 OR (a = 1 AND b = 2))` 的过滤条件简化为 `a = 1 AND b = 2` [#56005](https://github.com/pingcap/tidb/issues/56005) @[ghazalfamilyusa](https://github.com/ghazalfamilyusa)
- 在部分选中不优执行计划风险较高的场景中,提高代价模型中 Table Scan 的代价,使得优化器更倾向于使用索引 [#56012](https://github.com/pingcap/tidb/issues/56012) @[terry1purcell](https://github.com/terry1purcell)
- `MID` 函数支持两个参数的形式 [#52420](https://github.com/pingcap/tidb/issues/52420) @[dveeden](https://github.com/dveeden)
- 支持 `date_add`, `date_sub` 函数下推给 TiKV [#56297](https://github.com/pingcap/tidb/issues/56297) @[gengliqi](https://github.com/gengliqi)
- 支持对主键为非 binary 类型的表拆分 TTL 任务 [#55660](https://github.com/pingcap/tidb/issues/55660) @[lcwangchao](https://github.com/lcwangchao)
- 优化与系统元数据相关的语句性能 [#50305](https://github.com/pingcap/tidb/issues/50305) @[ywqzzy](https://github.com/ywqzzy) @[tangenta](https://github.com/tangenta) @[joechenrh](https://github.com/joechenrh) @[CbcWestwolf](https://github.com/CbcWestwolf)
- 实现新的优先级队列以提高性能并减少重建自动分析操作队列的开销 [#55906](https://github.com/pingcap/tidb/issues/55906) @[Rustin170506](https://github.com/Rustin170506)
- 引入 DDL 通知程序,以允许统计模块订阅 DDL 事件 [#55722](https://github.com/pingcap/tidb/issues/55722) @[fzzf678](https://github.com/fzzf678) @[lance6716](https://github.com/lance6716) @[Rustin170506](https://github.com/Rustin170506)
- TiDB 升级期间强制新版 TiDB 本节点接管 DDL Owner,避免旧版本 TiDB 节点接管而引发的一些兼容性问题 [#51285](https://github.com/pingcap/tidb/pull/51285) @[wjhuang2016](https://github.com/wjhuang2016)
- 支持集群级别的 Scatter Region 打散 [#8424](https://github.com/tikv/pd/issues/8424) @[River2000i](https://github.com/River2000i)
- Optimize internal function logic to improve performance when querying tables with numerous columns [#52112](https://github.com/pingcap/tidb/issues/52112) @[Rustin170506](https://github.com/Rustin170506)
- Simplify filter conditions like `a = 1 AND (a > 1 OR (a = 1 AND b = 2))` to `a = 1 AND b = 2` [#56005](https://github.com/pingcap/tidb/issues/56005) @[ghazalfamilyusa](https://github.com/ghazalfamilyusa)
- Increase the cost of Table Scan in the cost model for scenarios with high risk of suboptimal execution plans, making the optimizer to prefer indexes [#56012](https://github.com/pingcap/tidb/issues/56012) @[terry1purcell](https://github.com/terry1purcell)
- TiDB supports the two-argument variant `MID(str, pos)` [#52420](https://github.com/pingcap/tidb/issues/52420) @[dveeden](https://github.com/dveeden)
- Support splitting TTL tasks for tables with non-binary primary keys [#55660](https://github.com/pingcap/tidb/issues/55660) @[lcwangchao](https://github.com/lcwangchao)
- Optimize performance of system metadata-related statements [#50305](https://github.com/pingcap/tidb/issues/50305) @[ywqzzy](https://github.com/ywqzzy) @[tangenta](https://github.com/tangenta) @[joechenrh](https://github.com/joechenrh) @[CbcWestwolf](https://github.com/CbcWestwolf)
- Implement a new priority queue to improve performance and reduce the cost of rebuilding the auto-analyze operation queue [#55906](https://github.com/pingcap/tidb/issues/55906) @[Rustin170506](https://github.com/Rustin170506)
- Introduce DDL notifier to allow statistics module to subscribe to DDL events [#55722](https://github.com/pingcap/tidb/issues/55722) @[fzzf678](https://github.com/fzzf678) @[lance6716](https://github.com/lance6716) @[Rustin170506](https://github.com/Rustin170506)
- Force new TiDB nodes to take over DDL ownership during TiDB upgrades to avoid compatibility issues caused by old TiDB nodes taking ownership [#51285](https://github.com/pingcap/tidb/pull/51285) @[wjhuang2016](https://github.com/wjhuang2016)
- Support cluster-level Scatter Region [#8424](https://github.com/tikv/pd/issues/8424) @[River2000i](https://github.com/River2000i)

+ TiKV <!--tw@qiancai: 5 notes-->

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+ Backup & Restore (BR) <!--tw@Oreoxmt: 1 note-->

- 修复当 TiDB 节点停止时,监控中 PITR checkpoint 间隔大幅增量但与实际情况不符合的问题 [#42419](https://github.com/pingcap/tidb/issues/42419) @[YuJuncen](https://github.com/YuJuncen)
- Fix the issue that the PITR checkpoint interval in monitoring abnormally increased when TiDB nodes stopped, which does not reflect the actual situation [#42419](https://github.com/pingcap/tidb/issues/42419) @[YuJuncen](https://github.com/YuJuncen)
- (dup): release-6.5.11.md > 错误修复> Tools> Backup & Restore (BR) - 修复备份过程中由于 TiKV 没有响应导致备份任务无法结束的问题 [#53480](https://github.com/pingcap/tidb/issues/53480) @[Leavrth](https://github.com/Leavrth)
- (dup): release-6.5.11.md > 错误修复> Tools> Backup & Restore (BR) - 修复开启日志备份时,BR 日志可能打印权限凭证敏感信息的问题 [#55273](https://github.com/pingcap/tidb/issues/55273) @[RidRisR](https://github.com/RidRisR)
- (dup): release-6.5.11.md > 错误修复> Tools> Backup & Restore (BR) - 修复当 PITR 日志备份任务失败时,用户停止了该任务后,PD 中与该任务相关的 safepoint 未被正确清除的问题 [#17316](https://github.com/tikv/tikv/issues/17316) @[Leavrth](https://github.com/Leavrth)
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+ TiDB Lightning <!--tw@Oreoxmt: 1 note-->

- 修复使用并行导入并且具有相同的任务 ID 时,lightning 会报告 `verify allocator base failed` 错误的问题 [#55384](https://github.com/pingcap/tidb/issues/55384) @[ei-sugimoto](https://github.com/ei-sugimoto)
- Fix the issue that TiDB Lightning reports a `verify allocator base failed` error when using parallel import mode with identical task IDs [#55384](https://github.com/pingcap/tidb/issues/55384) @[ei-sugimoto](https://github.com/ei-sugimoto)

+ Dumpling

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