Add truncate support.

[ginkgoch]

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added, or deleted? (Required)

truncate ddl is supported, update the doc.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

What is the related PR or file link(s)?

• Related code change PR links (if applicable):
• This PR is translated from:
• Other reference link(s):

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

Summary by CodeRabbit

• Documentation
  • Updated the SQL compatibility guide to list TRUNCATE as supported.

[coderabbitai]

📝 Walkthrough

Walkthrough

The Lake SQL compatibility documentation now lists TRUNCATE as a supported DDL operation.

Changes

Lake SQL Compatibility

Layer / File(s)	Summary
Update DDL support table tidb-cloud/data-pipeline-lake-sql-compatibility.md	The DDL support table lists TRUNCATE as supported.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Merge Risk: 🔵 Low · up to eb92f

Confirm TRUNCATE support for the release-8.5 pipeline before relying on the new compatibility entry; document any version limit.

Architecture Summary

Architecture risk: 🔵 Low · up to eb92f

The change affects 1 system.

Changed systems: tidb-cloud

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — tidb-cloud (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in tidb-cloud/data-pipeline-lake-sql-compatibility.md: The DDL support table adds TRUNCATE with supported status.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the documented change: adding TRUNCATE support.
Description check		The description explains the documentation change and includes the required template sections. However, no affected TiDB version is selected, although the PR targets release-8.5.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[ti-chi-bot]

@sdojjy: adding LGTM is restricted to approvers and reviewers in OWNERS files.

Details

In response to this:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[coderabbitai]

Actionable comments posted: 1

---

ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository: pingcap/docs/.coderabbit.yaml
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: f24475f1-5261-4801-bf7e-a613421bc2d0

📥 Commits

Reviewing files that changed from the base of the PR and between e8298fb and eb92fde.

📒 Files selected for processing (1)

• tidb-cloud/data-pipeline-lake-sql-compatibility.md

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-10-09 05:02:09.276159948 +0000 UTC m=+361739.023390807: ☑️ agreed by qiancai.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [qiancai]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment