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planner: optimize decorrelate by removing redundant LIMIT when join key is unique

release-note-noneDenotes a PR that doesn't merit a release note.Denotes a PR that doesn't merit a release note.

sig/plannerSIG: PlannerSIG: Planner

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Status: Open (in progress).

pingcap/tidbnumber 64214

#64214 In pingcap/tidb;

· King-Dylan opened on Oct 31, 2025

planner: guard outer-join elimination to inner-only null-rejecting filters | tidb-test=pr/2606

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do-not-merge/needs-triage-completed

needs-cherry-pick-release-8.5Should cherry pick this PR to release-8.5 branch.Should cherry pick this PR to release-8.5 branch.

release-note-noneDenotes a PR that doesn't merit a release note.Denotes a PR that doesn't merit a release note.

sig/plannerSIG: PlannerSIG: Planner

size/XXLDenotes a PR that changes 1000+ lines, ignoring generated files.Denotes a PR that changes 1000+ lines, ignoring generated files.

Status: Open (in progress).

pingcap/tidbnumber 63504

#63504 In pingcap/tidb;

· King-Dylan opened on Sep 15, 2025

planner: Support tablescan elimination for indexmerge

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release-noteDenotes a PR that will be considered when it comes time to generate release notes.Denotes a PR that will be considered when it comes time to generate release notes.

sig/plannerSIG: PlannerSIG: Planner

size/XXLDenotes a PR that changes 1000+ lines, ignoring generated files.Denotes a PR that changes 1000+ lines, ignoring generated files.

Status: Open (in progress).

pingcap/tidbnumber 60136

#60136 In pingcap/tidb;

· King-Dylan opened on Mar 18, 2025

planner: support pushing TopN down into IndexLookUpReader

ok-to-testIndicates a PR is ready to be tested.Indicates a PR is ready to be tested.

release-note-noneDenotes a PR that doesn't merit a release note.Denotes a PR that doesn't merit a release note.

sig/plannerSIG: PlannerSIG: Planner

size/XXLDenotes a PR that changes 1000+ lines, ignoring generated files.Denotes a PR that changes 1000+ lines, ignoring generated files.

Status: Open (in progress).

pingcap/tidbnumber 59764

#59764 In pingcap/tidb;

· King-Dylan opened on Feb 26, 2025