planner: fix the global binding is not working when using Prepared Statement with "select ... as col ... group by col"

[qw4990]

What problem does this PR solve?

Issue Number: close #57992

Problem Summary: planner: fix the global binding is not working when using Prepared Statement with "select ... as col ... group by col"

What changed and how does it work?

planner: fix the global binding is not working when using Prepared Statement with "select ... as col ... group by col"

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

Summary by CodeRabbit

• Bug Fixes
  • Improved prepared-statement plan caching by preserving binding information for more reliable subsequent executions.
  • Avoided redundant SQL binding checks when a valid cached match is already available.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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Details

Needs approval from an approver in each of these files:

• pkg/bindinfo/OWNERS
• pkg/planner/OWNERS

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: b2862213-57bc-48cb-b7a9-77c095715a89

📥 Commits

Reviewing files that changed from the base of the PR and between 4894ac0 and 999b280.

📒 Files selected for processing (2)

• pkg/bindinfo/binding.go
• pkg/planner/core/plan_cache_utils.go

---

📝 Walkthrough

Walkthrough

Prepared statement plan cache entries now retain binding-matching context. Test-mode binding matching reuses an existing per-statement cache entry when no override is provided.

Changes

Prepared statement binding

Layer / File(s)	Summary
Prepared plan binding context pkg/planner/core/plan_cache_utils.go	Prepared statements compute a normalized binding digest and referenced table names, then store them in PlanCacheStmt.BindingInfo.
Cached binding match reuse pkg/bindinfo/binding.go	The test-mode path returns cached binding results when a cache entry exists and no override is supplied.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Poem

A rabbit watched the bindings hop,
Through prepared plans from start to stop.
Cached results now spring ahead,
With tables and digests neatly fed.
“No second match!” the rabbit said.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: fixing global binding for prepared statements with alias-based GROUP BY queries.
Description check	✅ Passed	The PR description follows the template, includes the issue number, problem summary, changes, and a test checklist item.
Linked Issues check	✅ Passed	The code changes address the reported prepared-statement binding gap and align with the issue's expected behavior.
Out of Scope Changes check	✅ Passed	The modified files are directly related to binding matching and plan cache handling, with no clear unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (2.12.2)

level=error msg="Running error: context loading failed: failed to load packages: failed to load packages: failed to load with go/packages: context deadline exceeded"
level=error msg="Timeout exceeded: try increasing it by passing --timeout option"

---

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[codecov]

Codecov Report

❌ Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.2886%. Comparing base (4894ac0) to head (999b280).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #69766        +/-   ##
================================================
- Coverage   76.3192%   74.2886%   -2.0307%     
================================================
  Files          2041       2051        +10     
  Lines        560139     575388     +15249     
================================================
- Hits         427494     427448        -46     
- Misses       131744     147692     +15948     
+ Partials        901        248       -653     

Flag	Coverage Δ
integration	40.8643% <58.3333%> (+1.1590%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	60.4471% <ø> (ø)
parser	∅ <ø> (∅)
br	47.4060% <ø> (-15.3154%)	⬇️

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