Issues

• executor: nil pointer dereference when an internal session sets a SEM v2 read-only system variable

  component/executormay-affects-7.5may-affects-8.1may-affects-8.5may-affects-25.10may-affects-26.3may-affects-26.9severity/majortype/bug
  pingcap/tidb#72011 · Filter by author D3Hunter opened on Oct 15, 2026

• tracking: Add opt-in RaBitQ quantization for HNSW vector indexes

  contribution
  pingcap/tidb#72010 · Filter by author onlyxiaohuang opened on Oct 15, 2026

• tracking: Evaluate additional vector index methods beyond HNSW

  contribution
  pingcap/tidb#72009 · Filter by author onlyxiaohuang opened on Oct 15, 2026

• docs: add a contributor guide for the vector search execution path

  contributionfirst-time-contributor
  pingcap/tidb#72008 · Filter by author onlyxiaohuang opened on Oct 15, 2026
  1

• import: reduce peak buffer memory in mydump block parser and KV encoder

  component/lightningtype/enhancement
  pingcap/tidb#72004 · Filter by author D3Hunter opened on Oct 15, 2026

• ddl: add metrics and alerts for add-index auto-pause caused by TiKV disk full

  component/ddlcomponent/metricstype/enhancement
  pingcap/tidb#72000 · Filter by author expxiaoli opened on Oct 15, 2026
  3

• planner: an index without stats may aggressively prune a better index with stats during skyline pruning

  report/customertype/enhancement
  pingcap/tidb#71999 · Filter by author qw4990 opened on Oct 15, 2026

• ROUND/TRUNCATE on DECIMAL and DOUBLE read a decimals argument of 2^63 or more as negative: ROUND(5.64, 9223372036854775808) = 0

  contributiontype/bug
  pingcap/tidb#71996 · Filter by author hanke580 opened on Oct 15, 2026

• REPEAT() and SPACE() return '' with no warning when the count is 2^63 or more, but NULL with warning 1301 for 2^63-1

  contributiontype/bug
  pingcap/tidb#71995 · Filter by author hanke580 opened on Oct 15, 2026

• TIKV_REGION_STATUS returns NULL TABLE_ID despite equality filter

  pingcap/tidb#71994 · Filter by author lilinghai opened on Oct 15, 2026

• [server] createSession leaks a session on two error paths

  component/serverseverity/minortype/bug
  pingcap/tidb#71990 · Filter by author D3Hunter opened on Oct 15, 2026

• [server] Malformed input panics or stalls the MySQL connection layer (zero-length packet; lazy cursor; empty compressed frame)

  component/serverseverity/moderatetype/bug
  pingcap/tidb#71991 · Filter by author D3Hunter opened on Oct 15, 2026

• [server] /plan_replayer/dump mis-parses schema_meta.txt (db.table format)

  component/serverseverity/moderatetype/bug
  pingcap/tidb#71989 · Filter by author D3Hunter opened on Oct 15, 2026

• [server] Connection accounting leaks (unix-socket accept error path; COM_CHANGE_USER per-user count)

  component/servermay-affects-7.5may-affects-8.1may-affects-8.5may-affects-25.10may-affects-26.3may-affects-26.9severity/majortype/bug
  pingcap/tidb#71988 · Filter by author D3Hunter opened on Oct 15, 2026

• [server] Unrecovered panics can crash TiDB (ReportMPPTaskStatus nil Meta; KillNonFlashbackClusterConn nil process info)

  component/servermay-affects-7.5may-affects-8.1may-affects-8.5may-affects-25.10may-affects-26.3may-affects-26.9severity/majortype/bug
  pingcap/tidb#71987 · Filter by author D3Hunter opened on Oct 15, 2026

• executor: DISTRIBUTE TABLE and SHOW TABLE DISTRIBUTIONS send key ranges without keyspace prefix on keyspace clusters

  pingcap/tidb#71986 · Filter by author bufferflies opened on Oct 15, 2026
  1

• Flaky test: TestTopSQLStatementStats4 in pkg/server/tests/commontest

  component/testflaky-testtype/enhancement
  pingcap/tidb#71984 · Filter by author ti-chi-bot opened on Oct 15, 2026

• server: tidb_server_connections per resource group drifts on COM_CHANGE_USER again since v8.5.8 (regression of #65607)

  contributionfirst-time-contributorseverity/moderatesig/sql-infratype/bug
  pingcap/tidb#71969 · Filter by author justin0u0 opened on Oct 14, 2026
  3

• session: StmtRollback can panic while accounting for MemDB cleanup

  affects-7.5affects-8.1affects-8.5affects-25.10affects-26.3affects-26.9component/sessionseverity/majorsig/transactiontype/bug
  pingcap/tidb#71966 · Filter by author King-Dylan opened on Oct 14, 2026
  

• EXPLAIN ANALYZE on a write stmt ignores the SET_VAR(sql_mode) hint, plans TiKV instead of TiFlash

  contributionseverity/moderatesig/plannertype/bug
  pingcap/tidb#71964 · Filter by author WalterWj opened on Oct 14, 2026
  2

• Flaky test: TestTopSQLStatementStats3 in pkg/server/tests/commontest

  component/testflaky-testtype/enhancement
  pingcap/tidb#71963 · Filter by author ti-chi-bot opened on Oct 14, 2026

• Flaky test: TestStmtSummaryEvictedPointGet in pkg/infoschema/test/clustertablestest

  component/testflaky-testtype/enhancement
  pingcap/tidb#71962 · Filter by author ti-chi-bot opened on Oct 14, 2026

• Flaky test: TestManager/close_removes_virtual_server_info in pkg/domain/crossks

  component/testflaky-testtype/enhancement
  pingcap/tidb#71961 · Filter by author ti-chi-bot opened on Oct 14, 2026

• distsql: Scan -> Limit runs cop tasks one at a time even when unique-key points can't reach the limit

  contributiontype/enhancement
  pingcap/tidb#71959 · Filter by author sanketkedia opened on Oct 13, 2026

• planner: explicit IS NOT NULL filters prevent partial-index plan cache reuse

  component/spmseverity/moderatetype/bug
  pingcap/tidb#71955 · Filter by author winoros opened on Oct 13, 2026