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PREPARE INSERT with COMPRESS(?) returns ERROR 1406 when prepared plan cache is enabled

epic/plan-cache

report/customerCustomers have encountered this bug.Customers have encountered this bug.

sig/plannerSIG: PlannerSIG: Planner

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

Status: Open.

#68642 In pingcap/tidb;

· pcqz7 opened on May 26, 2026

Flaky test: TestStalenessAndHistoryRead in tests/realtikvtest/txntest

component/test

flaky-test

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

Status: Open.

#68638 In pingcap/tidb;

· ti-chi-bot opened on May 26, 2026

There is a 3.7% performance regression in sysbench after PR#68237

may-affects-7.1

may-affects-7.5

may-affects-8.1

may-affects-8.5

severity/critical

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

Status: Open.

#68633 In pingcap/tidb;

· owlsome2501 opened on May 25, 2026

planner: compress large IN-List into a Range-Scan + Selection

report/customerCustomers have encountered this bug.Customers have encountered this bug.

sig/plannerSIG: PlannerSIG: Planner

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

Status: Open.

#68623 In pingcap/tidb;

· qw4990 opened on May 25, 2026

The FTS estimates the number of rows incorrectly when the number of rows to be fts filtered is very large

feature/developingthe related feature is in developmentthe related feature is in development

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

Status: Open.

#68619 In pingcap/tidb;

· lilinghai opened on May 24, 2026

FTS line count estimation is not used in the optimizer

feature/developingthe related feature is in developmentthe related feature is in development

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

Status: Open.

#68618 In pingcap/tidb;

· lilinghai opened on May 24, 2026

Inconsistent results: HAVING vs equivalent derived-table+WHERE rewriting on multi-table query with DEFAULT()/CAST AS DATETIME

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.

#68617 In pingcap/tidb;

· Manuel-Neuer1 opened on May 24, 2026

Wrong result: HAVING clause with NOT(non-aggregate-pred OR aggregate-pred) produces incorrect rows due to non-aggregate predicate being pushed down to cop[tikv] Selection

ai-bugfix

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.

#68616 In pingcap/tidb;

· Manuel-Neuer1 opened on May 24, 2026

dumpling: --rows with output template missing {{.Index}} can overwrite chunk files

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

component/dumplingThis is related to Dumpling of TiDB.This is related to Dumpling of TiDB.

severity/moderate

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

Status: Open.

#68611 In pingcap/tidb;

· D3Hunter opened on May 23, 2026

Flaky test: TestGCScanTasks in pkg/ttl/ttlworker

component/test

flaky-test

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

Status: Open.

#68607 In pingcap/tidb;

· ti-chi-bot opened on May 23, 2026

Flaky test: TestRefreshStatsConcurrently in pkg/executor

component/test

flaky-test

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

Status: Open.

#68606 In pingcap/tidb;

· ti-chi-bot opened on May 23, 2026

server: support CLIENT_OPTIONAL_RESULTSET_METADATA

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

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

Status: Open.

#68597 In pingcap/tidb;

· moonsphere opened on May 22, 2026