Issues

• TiFlash can crash on oversized ELT indices and invalid join/sort parameters

  affects-7.5affects-8.1affects-8.5affects-25.10affects-26.3affects-26.9severity/majortype/bug
  pingcap/tiflash#11241 · Filter by author windtalker opened on Nov 5, 2026

• TiFlash v8.5.8: MergeDelta repeatedly fails with “invalid field index” after a zero-length partial Page read, including after restart

  contribution
  pingcap/tiflash#11237 · Filter by author lazzyfu opened on Nov 5, 2026

• TiFlash v8.5.8: SIGSEGV in RegionCollector::run during a BTreeMap range lookup

  contribution
  pingcap/tiflash#11236 · Filter by author lazzyfu opened on Nov 5, 2026

• TiFlash v8.5.8: SIGSEGV in Block::cloneEmptyColumns while flushing a ColumnFileInMemory

  contribution
  pingcap/tiflash#11235 · Filter by author lazzyfu opened on Nov 5, 2026
  1

• SQL parser can overflow the stack on deeply nested input

  affects-7.5affects-8.1affects-8.5affects-25.10affects-26.3affects-26.9severity/majortype/bug
  pingcap/tiflash#11231 · Filter by author windtalker opened on Nov 4, 2026

• Enable columnar L2 late materialization by default

  type/enhancement
  pingcap/tiflash#11210 · Filter by author yongman opened on Nov 4, 2026

• Array deserialization can build a ColumnArray whose offsets exceed the nested column

  affects-8.5affects-26.3affects-26.9severity/moderatetype/bug
  pingcap/tiflash#11206 · Filter by author JinheLin opened on Nov 3, 2026

• [next gen] EstablishDisaggTask timeout (60s) on write node after TiFlash CN failure

  pingcap/tiflash#11177 · Filter by author Lily2025 opened on Nov 3, 2026
  2

  

• release-8.5 refuses to start when config contains a setting removed in v8.0 (e.g. profiles.default.use_uncompressed_cache)

  affects-8.5affects-26.3affects-26.9component/storageseverity/majortype/bug
  pingcap/tiflash#11174 · Filter by author Lily2025 opened on Nov 3, 2026
  

• Disaggregated TiFlash: FetchDisaggPages UNAVAILABLE aborts Q1 during rolling upgrade with two available replicas

  contributiontype/bug
  pingcap/tiflash#11169 · Filter by author together-wang opened on Oct 29, 2026
  1

• MPP query fails with "Cannot LZ4_decompress_safe" when one probe row matches many build rows

  component/compute
  pingcap/tiflash#11167 · Filter by author 0xPoe opened on Oct 28, 2026

• use DST session timezone may cause missing records in rough filter

  affects-26.3affects-26.9component/storageseverity/moderatetype/bug
  pingcap/tiflash#11166 · Filter by author yongman opened on Oct 28, 2026
  

• Enable log redaction by default in TiFlash Server and Proxy

  affects-8.5component/storagetype/enhancement
  pingcap/tiflash#11160 · Filter by author 3pointer opened on Oct 27, 2026

• CAST of a string to a 64-bit int does not go through the 64-bit domain like TiDB

  component/computecontributionfirst-time-contributor
  pingcap/tiflash#11156 · Filter by author lohmag opened on Oct 24, 2026
  1

• columnar: support Azure Blob storage and Key Vault master keys

  component/storagecontribution
  pingcap/tiflash#11119 · Filter by author iosmanthus opened on Oct 13, 2026

• Support online migration from tiflash disagg-write to columnar

  component/storagetype/enhancement
  pingcap/tiflash#11105 · Filter by author JaySon-Huang opened on Sep 22, 2026
  

• Replace the JSON_VALID workaround with general short-circuit evaluation

  type/enhancement
  pingcap/tiflash#11086 · Filter by author ChangRui-Ryan opened on Sep 10, 2026

• flaky test: StorageDeltaMergeTest.RestoreAfterClearData

  component/storagetype/bug
  pingcap/tiflash#11079 · Filter by author JaySon-Huang opened on Sep 7, 2026

• ColumnarScanContext serialize/deserialize new fields to tipb and tidb

  type/enhancement
  pingcap/tiflash#11071 · Filter by author yongman opened on Sep 1, 2026

• test: EventTestRunner.throwException times out during cancellation

  component/computetype/bug
  pingcap/tiflash#11069 · Filter by author wuhuizuo opened on Sep 1, 2026

• Timestamp with session timezone column support late materialization

  type/enhancement
  pingcap/tiflash#11067 · Filter by author yongman opened on Aug 31, 2026
  

• MPP task can remain alive after cancel and abort return

  pingcap/tiflash#11059 · Filter by author King-Dylan opened on Aug 26, 2026
  2

  

• TiFlash: read only StringSizes for LENGTH / CHAR_LENGTH scans

  type/feature-requesttype/performance
  pingcap/tiflash#11051 · Filter by author JaySon-Huang opened on Aug 18, 2026

• TiFlash: pack-level max_len skip for MAX(CHAR_LENGTH) / MAX(LENGTH)

  type/feature-requesttype/performance
  pingcap/tiflash#11050 · Filter by author JaySon-Huang opened on Aug 18, 2026

• TiFlash: optimize full-table MAX(CHAR_LENGTH) scans on string columns

  type/enhancementtype/performance
  pingcap/tiflash#11049 · Filter by author JaySon-Huang opened on Aug 18, 2026
  2