*: upgrade go version to 1.25.14

[lidezhu]

What problem does this PR solve?

Issue Number: close #12868

What is changed and how it works?

Check List

Tests

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

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

Please refer to [Release Notes Language Style Guide](https://pingcap.github.io/tidb-dev-guide/contribute-to-tidb/release-notes-style-guide.html) to write a quality release note.

If you don't think this PR needs a release note then fill it with `None`.

Summary by CodeRabbit

• Bug Fixes

  • Fixed changefeed restart handling during an in-progress column addition, preventing columns in DeleteOnly state from being incorrectly emitted as NULL values.

• Tests

  • Added regression coverage for schema recovery and row mounting after a restart during column changes.

• Chores

  • Updated the project and example modules to use Go 1.25.14 for more consistent builds and integration testing.

[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 1a935861-8b47-4a22-a160-519bda46005a

📥 Commits

Reviewing files that changed from the base of the PR and between 03ed243 and 765500c.

📒 Files selected for processing (7)

• cdc/entry/mounter_test.go
• deployments/ticdc/docker/integration-test.Dockerfile
• examples/golang/avro-checksum-verification/go.mod
• examples/golang/canal-json-handle-key-only/go.mod
• go.mod
• tests/integration_tests/debezium/go.mod
• tools/check/go.mod

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📝 Walkthrough

Walkthrough

The change adds a regression test for mounter restart behavior with a DeleteOnly column and updates Go toolchain declarations from 1.25.12 to 1.25.14 across the repository.

Changes

Mounter regression coverage

Layer / File(s)	Summary
Restarted DeleteOnly column test cdc/entry/mounter_test.go	The test persists intermediate table metadata, recreates schema storage and the mounter, decodes the physical row, and verifies that the DeleteOnly column is not emitted in DML.

Go version alignment

Layer / File(s)	Summary
Go toolchain version updates deployments/ticdc/docker/integration-test.Dockerfile, go.mod, examples/golang/*/go.mod, tests/integration_tests/debezium/go.mod, tools/check/go.mod	The Docker build toolchain and Go module directives are updated from 1.25.12 to 1.25.14.

Priority: ⬇️ Low

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

Change: Other

Suggested reviewers: asddongmen

Merge Risk: ⚪ Minimal · up to 76550

The change adds regression coverage and aligns Go toolchain versions without evidenced correctness, deployment, or compatibility risk. It is ready to merge with normal checks.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files. (6 skipped: 6…	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	⚠️ Warning	The description includes the issue number, but the change summary, testing details, compatibility assessment, documentation assessment, and release note are incomplete. The checklist also remains unse…	Describe the Go version upgrade and the regression test. Select the applicable test item and remove the others. State whether compatibility or performance changes are expected, address documentation updates, and add a release note or write …

✅ Passed checks (3 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the primary change: upgrading the Go version to 1.25.14.

Full details: Docstring Coverage

Explanation

Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files. (6 skipped: 6 unsupported.)

Full details: Description check

Explanation

The description includes the issue number, but the change summary, testing details, compatibility assessment, documentation assessment, and release note are incomplete. The checklist also remains unselected.

Resolution

Describe the Go version upgrade and the regression test. Select the applicable test item and remove the others. State whether compatibility or performance changes are expected, address documentation updates, and add a release note or write None.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

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DeleteOnly stays hidden below
The mounter restarts, the test runs bright
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.0775%. Comparing base (03ed243) to head (5a8f068).
✅ All tests successful. No failed tests found.

Additional details and impacted files

Components	Coverage Δ
cdc	57.4490% <ø> (∅)
dm	50.8642% <ø> (∅)
engine	50.6772% <ø> (+0.0225%)	⬆️

Flag	Coverage Δ
cdc	57.4490% <ø> (?)
unit	54.0775% <ø> (+3.4228%)	⬆️

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

@@               Coverage Diff                @@
##             master     #12867        +/-   ##
================================================
+ Coverage   50.6546%   54.0775%   +3.4228%     
================================================
  Files           213       1013       +800     
  Lines         17720     141802    +124082     
================================================
+ Hits           8976      76683     +67707     
- Misses         8178      59365     +51187     
- Partials        566       5754      +5188     

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[lidezhu]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nongfushanquan, wk989898

The full list of commands accepted by this bot can be found here.

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Details

Needs approval from an approver in each of these files:

• OWNERS [wk989898]

Approvers can indicate their approval by writing /approve in a comment
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-09-22 01:45:43.946332598 +0000 UTC m=+69269.171553706: ☑️ agreed by wk989898.
• 2026-09-22 02:01:12.906248143 +0000 UTC m=+70198.131469251: ☑️ agreed by nongfushanquan.

[lidezhu]

/retest

[lidezhu]

/test pull-cdc-integration-pulsar-test

[lidezhu]

/test pull-cdc-integration-kafka-test

[lidezhu]

/test pull-cdc-integration-storage-test

[lidezhu]

/test pull-dm-integration-test

[lidezhu]

/test pull-cdc-integration-storage-test

[lidezhu]

/test pull-cdc-integration-mysql-test

[lidezhu]

/test pull-cdc-integration-mysql-test

[lidezhu]

/test pull-cdc-integration-kafka-test

[lidezhu]

/test pull-cdc-integration-storage-test

[wuhuizuo]

/test pull-cdc-integration-mysql-test

[wuhuizuo]

/test pull-dm-integration-test
/retest

[wuhuizuo]

/test pull-dm-integration-test

[wuhuizuo]

/test pull-cdc-integration-pulsar-test

[wuhuizuo]

/test pull-cdc-integration-kafka-test

[wuhuizuo]

/test pull-cdc-integration-storage-test

[wuhuizuo]

/test pull-cdc-integration-mysql-test

[lidezhu]

/retest

[lidezhu]

/run-cherry-picker

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #12869.