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Planner: correlate a non-correlated IN subquery

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#66320 In pingcap/tidb;

· terry1purcell opened on Feb 21, 2026

INSERT skips VARCHAR/CHAR length truncation when charset validation fires (utf8mb4 into utf8, non-strict mode)

Status: Open.

#66319 In pingcap/tidb;

· alastori opened on Feb 20, 2026

Import Into: potential regression after #62419 removed coarse split/scatter for large IMPORT INTO

component/DXFDistributed eXecute Framework of tidbDistributed eXecute Framework of tidb

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#66311 In pingcap/tidb;

· OliverS929 opened on Feb 19, 2026

Short circuit CONSTRAINTS not being true in WHERE clause

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#66309 In pingcap/tidb;

· mjonss opened on Feb 18, 2026

SHOW STATS_TOPN and SHOW STATS_BUCKETS does not display the actual values correctly for [VAR]CHAR types

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#66307 In pingcap/tidb;

· mjonss opened on Feb 18, 2026

Consolidate single column index stats with column stats

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#66306 In pingcap/tidb;

· mjonss opened on Feb 18, 2026

The simple prepared query run out of 1 GiB memory with only 70 rows

contributionThis PR is from a community contributor.This PR is from a community contributor.

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#66301 In pingcap/tidb;

· DerZc opened on Feb 17, 2026

Tree based explain format

type/feature-requestCategorizes issue or PR as related to a new feature.Categorizes issue or PR as related to a new feature.

Status: Open.

#66299 In pingcap/tidb;

· dveeden opened on Feb 17, 2026

PhysicalIndexMergeReader.ResolveIndices references _tidb_rowid on table with CLUSTERED integer primary key

contributionThis PR is from a community contributor.This PR is from a community contributor.

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#66298 In pingcap/tidb;

· HubertusWine opened on Feb 17, 2026

Planner: Suboptimal plan choices for multiple indexes with order requirement

type/enhancementThe issue or PR belongs to an enhancement.The issue or PR belongs to an enhancement.

Status: Open.

#66297 In pingcap/tidb;

· terry1purcell opened on Feb 17, 2026

runtime error: index out of range under concurrent query + add/drop index

AI-Testing

severity/major

sig/plannerSIG: PlannerSIG: Planner

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#66291 In pingcap/tidb;

· hawkingrei opened on Feb 16, 2026

ddl: flaky TiFlash replica test <code>TestInfoSchemaForTiFlashReplica</code> &amp; <code>TestSetTiFlashReplicaForTemporaryTable</code>

affects-8.5This bug affects the 8.5.x(LTS) versions.This bug affects the 8.5.x(LTS) versions.

component/ddlThis issue is related to DDL of TiDB.This issue is related to DDL of TiDB.

severity/major

type/bugThe issue is confirmed as a bug.The issue is confirmed as a bug.

Status: Open.

#66287 In pingcap/tidb;

· bb7133 opened on Feb 15, 2026