sql-statement-drop-stats: fix STATS_META output after DROP STATS

[doc-claw-bot]

What is changed, added or deleted? (Required)

• Clarify that DROP STATS removes histogram-related statistics but does not delete the STATS_META row.
• Update the example output to show that SHOW STATS_META still returns the row count and modify count after DROP STATS.
• Align the statement page with the current TiDB behavior verified during doc feedback handling.

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

• 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)?

• This PR is translated from:
• Other reference link(s):
  • https://docs.pingcap.com/tidb/stable/sql-statement-drop-stats/

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 DROP STATS example to clarify that table metadata, including modification and row counts, is retained.
  • Clarified that histogram statistics, such as TopN and buckets, are cleared.
  • Updated the expected output to include the retained metadata and last analysis time.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 83b729c and 7ff4102.

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• sql-statements/sql-statement-drop-stats.md

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📝 Walkthrough

Walkthrough

The DROP STATS example now shows that STATS_META retains Modify_count and Row_count while TopN and histogram buckets are cleared.

Changes

DROP STATS documentation

Layer / File(s)	Summary
Update STATS_META example sql-statements/sql-statement-drop-stats.md	The output now includes Last_analyze_time and the retained metadata row after DROP STATS. The example states that TopN and histogram buckets are cleared.

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

Merge Risk: ⚪ Minimal · up to 7ff41

This localized documentation update clarifies the documented DROP STATS and STATS_META behavior without changing product code; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the documentation fix for STATS_META output after DROP STATS.
Description check	✅ Passed	The description includes the required change summary, affected version, reference link, AI involvement, and applicability checklist. It is complete and aligned with the pull request objectives.
Docstring Coverage	✅ Passed	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	✅ 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.

Full details: Docstring Coverage

Explanation

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 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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