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[WIP]: add v8.5.4 release notes #21000

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aba762e
Create release-8.5.4.md
qiancai Oct 15, 2025
a5c23fd
Update release-8.5.4.md
qiancai Oct 15, 2025
a8b60d9
removed issues already merged in v8.5.3
qiancai Oct 15, 2025
d6276c2
Update release-8.5.4.md
qiancai Oct 15, 2025
7834050
add tiflash improvements and bug bixes
qiancai Oct 16, 2025
be13155
add transaction bug fixes
qiancai Oct 20, 2025
44361ff
add bug fixes for execution
qiancai Oct 20, 2025
7e54b2f
pd dc
bufferflies Oct 20, 2025
79de7e2
add cdc bug fixes
qiancai Oct 21, 2025
c1d5e3e
add TiKV improvements
qiancai Oct 21, 2025
19224e1
remove the placeholder TiKV notes as there is no bug fix in v8.5.4 fo...
qiancai Oct 21, 2025
65f4058
add planner bug fixes
qiancai Oct 21, 2025
fb19fba
add planner improvements
qiancai Oct 21, 2025
b251d64
add improvements and bug fixes for DDL\Lightning\Dumpling\DM\binlog
qiancai Oct 21, 2025
ac03800
adjust format and add br bug fixes
qiancai Oct 22, 2025
7d652a0
remove empty notes placeholder
qiancai Oct 22, 2025
daabc07
remove tikv #18743 (as this issue appears twice)
qiancai Oct 22, 2025
4d90861
fix format issues on links
qiancai Oct 24, 2025
5169c9d
Remove placeholder notes from release notes
qiancai Oct 24, 2025
24cae23
add sql/infra improvements and bug fixes
qiancai Oct 27, 2025
a1317fa
add tw assignment info
qiancai Oct 27, 2025
a799984
Apply suggestions from code review
hfxsd Oct 28, 2025
8d1d43f
Update releases/release-8.5.4.md
hfxsd Oct 28, 2025
a1606cd
Update releases/release-8.5.4.md
hfxsd Oct 28, 2025
302b011
Update releases/release-8.5.4.md
hfxsd Oct 29, 2025
4128e94
update PD and TiCDC
Oreoxmt Oct 29, 2025
9a9ce40
update Compatibility changes and TiDB
Oreoxmt Oct 29, 2025
17b3bb9
Update releases/release-8.5.4.md
hfxsd Oct 29, 2025
a70dc43
update tiflash enhancement
JaySon-Huang Oct 29, 2025
c05b3cc
Apply suggestions from code review
hfxsd Oct 30, 2025
0595ad5
Apply suggestions from code review
hfxsd Oct 30, 2025
99abef5
Apply suggestions from code review
qiancai Oct 31, 2025
0697a48
remove the duplicated #9013
qiancai Oct 31, 2025
fd28ec9
Update releases/release-8.5.4.md
qiancai Oct 31, 2025
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add planner improvements 
Co-authored-by: Elsa <111482174+elsa0520@users.noreply.github.com>
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qiancai and elsa0520 authored Oct 21, 2025
commit fb19fbabac77d886fb495a2d434da86b3a0535b4

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8 changes: 8 additions & 0 deletions releases/release-8.5.4.md
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,14 @@ TiDB 版本:8.5.4
- note [#issue](https://github.com/pingcap/tidb/issues/${issue-id}) @[贡献者 GitHub ID](https://github.com/${github-id})
- (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)
- 新增配置项 tidb_opt_enable_semi_join_rewrite 去控制 exists 子查询是否需要被改写 [#44850](https://github.com/pingcap/tidb/issues/44850) @[terry1purcell](https://github.com/terry1purcell)
- 微调了优化器选择逻辑,在某些情况下新索引更容易被选中 [#57948]([https://github.com/pingcap/tidb/issues/57948](https://github.com/pingcap/tidb/issues/57948))[)](https://github.com/pingcap/tidb/issues/57948)) @[terry1purcell]([https://github.com/terry1purcell](https://github.com/terry1purcell))[)](https://github.com/terry1purcell))
- 优化了 NDV 较小的列的查询估算逻辑 [#61792](https://github.com/pingcap/tidb/issues/61792) @[terry1purcell](https://github.com/terry1purcell)
- 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)

+ TiKV

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