Issues

• Partial index documentation lists IN predicates as supported, but TiDB v8.5.8 rejects them

  component/ddlcontributionseverity/moderatetype/bug
  pingcap/tidb#71733 · Filter by author Zhs17 opened on Oct 3, 2026
  2

• planner: dirty partition tables lose Point_Get outside the fast path

  affects-9.0affects-26.3affects-26.9component/tablepartitionseverity/moderatesig/plannertype/bug
  pingcap/tidb#71730 · Filter by author winoros opened on Oct 1, 2026

• statistics: derive NDV from schema-guaranteed uniqueness

  component/statisticstype/enhancement
  pingcap/tidb#71720 · Filter by author 0xPoe opened on Oct 1, 2026

• index advisor: add an option to disable covering-index candidate generation

  contributiontype/enhancement
  pingcap/tidb#71719 · Filter by author wencycool opened on Oct 1, 2026

• br: support custom S3 SSE-KMS encryption context for snapshot and log backups

  component/brtype/feature-request
  Feature

  pingcap/tidb#71717 · Filter by author King-Dylan opened on Oct 1, 2026

• planner: enable COALESCE UPDATE plan caching in stages with decimal precision guards

  affects-26.3component/expressionepic/plan-cachesig/plannertype/enhancement
  pingcap/tidb#71709 · Filter by author AilinKid opened on Sep 30, 2026

• executor: IndexJoin OOM panic during inner result collection leaks the inner executor and worker

  affects-26.3component/executorimpact/leakmay-affects-7.5may-affects-8.1may-affects-8.5may-affects-25.10may-affects-26.9severity/majortype/bug
  pingcap/tidb#71708 · Filter by author AilinKid opened on Sep 30, 2026

• Statement summary history does not prune time ranges for prepared FROM_UNIXTIME parameters

  pingcap/tidb#71706 · Filter by author jiong-nba opened on Sep 30, 2026

• copr: lock-fallback retry keeps replica_read=true on the leader, bypassing TiKV In-Memory Engine

  component/tikvcontributionseverity/moderatetype/bug
  pingcap/tidb#71705 · Filter by author sanketkedia opened on Sep 30, 2026
  2

• expression: IN(...) AND x <> '' returns a row even though x <> '' evaluates to false

  contributionfirst-time-contributormay-affects-7.5may-affects-8.1may-affects-8.5may-affects-25.10may-affects-26.3may-affects-26.9severity/criticalsig/executiontype/bug
  pingcap/tidb#71700 · Filter by author AnnCalla opened on Sep 29, 2026
  6

• planner: constant propagation copies a large multi-column IN list into IndexJoin other conditions on release-8.5 (backport #62864 and #63061)

  contribution
  pingcap/tidb#71698 · Filter by author moonsphere opened on Sep 29, 2026
  1

• DDL ingest temp-dir cleaner can delete an active cross-keyspace ADD INDEX directory

  component/ddlcomponent/DXFmay-affects-7.5may-affects-8.1may-affects-8.5may-affects-25.10may-affects-26.3may-affects-26.9severity/majortype/bug
  pingcap/tidb#71694 · Filter by author GMHDBJD opened on Sep 29, 2026
  3

• UPDATE and INSERT ... ON DUPLICATE KEY UPDATE can deadlock on the same row with a NONCLUSTERED primary key

  type/question
  pingcap/tidb#71682 · Filter by author overvenus opened on Sep 29, 2026
  2

• Flaky test: TestMockAutoIDServiceError/RPC_retry_limit_error_is_not_ignored in pkg/executor/test/autoidtest

  component/testflaky-testtype/enhancement
  pingcap/tidb#71671 · Filter by author ti-chi-bot opened on Sep 29, 2026

• Flaky test: TestMockAutoIDServiceError in pkg/executor/test/autoidtest

  component/testflaky-testtype/enhancement
  pingcap/tidb#71670 · Filter by author ti-chi-bot opened on Sep 29, 2026

• Flaky test: TestStatementRUReportModesSQL/result in pkg/executor

  component/testflaky-testtype/enhancement
  pingcap/tidb#71669 · Filter by author ti-chi-bot opened on Sep 29, 2026

• Flaky test: TestStatementRUReportModesSQL/full in pkg/executor

  component/testflaky-testtype/enhancement
  pingcap/tidb#71668 · Filter by author ti-chi-bot opened on Sep 29, 2026

• Flaky test: TestStatementRUReportModesSQL in pkg/executor

  component/testflaky-testtype/enhancement
  pingcap/tidb#71667 · Filter by author ti-chi-bot opened on Sep 29, 2026

• Flaky test: TestPointReadScanDetailsInDiagnostics in pkg/executor

  component/testflaky-testtype/enhancement
  pingcap/tidb#71666 · Filter by author ti-chi-bot opened on Sep 29, 2026
  4

• go.mod: update PD client to the latest tikv/pd release-nextgen-202609 commit

  component/pdtype/enhancement
  pingcap/tidb#71652 · Filter by author JmPotato opened on Sep 28, 2026

• [Foreign Key] ON DELETE CASCADE can leave a query-visible orphan after a successful large delete on TiDBX NextGen

  component/tikvmay-affects-7.5may-affects-8.1may-affects-8.5may-affects-25.10may-affects-26.3may-affects-26.9severity/majortype/bug
  pingcap/tidb#71648 · Filter by author Lily2025 opened on Sep 28, 2026
  6

  

• TiDB MOD() returns an incorrectly truncated result when operating on a TEXT value with a correlated scalar subquery

  contributionmay-affects-7.5may-affects-8.1may-affects-8.5may-affects-25.10may-affects-26.3may-affects-26.9severity/criticalsig/executiontype/bug
  pingcap/tidb#71644 · Filter by author LLMTesting-Ojiken opened on Sep 27, 2026
  3

• Flaky test: TestFlushStatsDelta/requires_default_db_for_bare_table in pkg/executor

  component/testflaky-testtype/enhancement
  pingcap/tidb#71632 · Filter by author ti-chi-bot opened on Sep 25, 2026

• Flaky test: TestFlushStatsDelta in pkg/executor

  affects-8.5component/testflaky-testtype/enhancement
  pingcap/tidb#71631 · Filter by author ti-chi-bot opened on Sep 25, 2026
  2

• Flaky test: TestMultiSchemaChangePreservesCloudStorageMode in pkg/ddl

  component/testflaky-testtype/enhancement
  pingcap/tidb#71630 · Filter by author ti-chi-bot opened on Sep 25, 2026