functions-and-operators, releases: clarify TIDB_DECODE_SQL_DIGESTS wording

[yahonda]

What is changed, added or deleted? (Required)

Rewords the parenthetical describing TIDB_DECODE_SQL_DIGESTS()'s output from
"a form without formats and arguments" to "without value formats or arguments",
in 4 places (3 in functions-and-operators/tidb-functions.md, 1 in
releases/release-5.2.0.md).

The original phrasing uses "form" and "formats" as two separate words with the
same root meaning right next to each other ("a form without formats"), which
reads as slightly self-contradictory even in English, and becomes worse once
translated: in Japanese, both "form" and "format" map to the same word (形式),
so the translated sentence ends up reading as "a 形式 without 形式" — literally
"a form without form" — with no way to distinguish the two senses. Simplifying
to a single clear phrase avoids this.

Found while reviewing the Japanese translation for this exact confusion.

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

• master (the latest development version)

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

• 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
  • Clarified that normalized SQL returned by TIDB_DECODE_SQL_DIGESTS() excludes literal value formats and arguments.
  • Updated the function reference and release notes to describe replaced values using placeholders such as ? or ....

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 6e25fce and bed1403.

📒 Files selected for processing (2)

• functions-and-operators/tidb-functions.md
• releases/release-5.2.0.md

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📝 Walkthrough

Walkthrough

The documentation updates descriptions of TIDB_DECODE_SQL_DIGESTS() in the TiDB function reference and the 5.2.0 release notes. The text clarifies normalized SQL wording and literal placeholders.

Changes

SQL digest documentation

Layer / File(s)	Summary
Normalized SQL description wording functions-and-operators/tidb-functions.md, releases/release-5.2.0.md	The descriptions of TIDB_DECODE_SQL_DIGESTS() now clarify that normalized SQL excludes value formats and arguments. The release note specifies literal placeholders such as ? or ....

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

Merge Risk: ⚪ Minimal · up to bed14

This clarifies normalized SQL wording across the relevant documentation without changing product behavior. The update is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the affected documentation areas and the main wording clarification for TIDB_DECODE_SQL_DIGESTS().
Description check	✅ Passed	The description explains the wording change and its translation-related rationale. It includes the required change summary and affected version, plus the remaining template sections. The reference-lin…
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: Description check

Explanation

The description explains the wording change and its translation-related rationale. It includes the required change summary and affected version, plus the remaining template sections. The reference-link fields are empty, but they are non-critical for this documentation-only change.

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. (2 skipped: 2 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[qiancai]

Rest LGTM

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[LGTM Timeline notifier]

Timeline:

• 2026-09-03 06:32:55.598802222 +0000 UTC m=+1347410.769896348: ☑️ agreed by qiancai.

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