i18n(ja): use the common renderings for partial index and pruning in the v8.5.7 release notes

[yahonda]

What is changed, added or deleted? (Required)

Makes two terms in the Japanese v8.5.7 release notes match the rest of the docs:

• "partial index" was left in English in three bullets: TiCDC ×2 and the foreign key bug fix. It is now 部分インデックス, which the same file's feature section already uses (L42-L46). The sql-statement-create-index.md heading is 「## 部分インデックス」.
• "pruning irrelevant indexes" (L165) was rendered as 枝刈り. It is now プルーニング, which is the dominant rendering in the docs (for example 動的プルーニングモード). The same release-note item in tidb-cloud/releases/tidb-x-cloud.202603.1.md also uses プルーニング, in the 2026-10-01 sync i18n-ja-release-8.5: translate doc changes from pingcap/docs release-8.5 on 2026-10-01 #24132.

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• i18n-ja-release-8.5 (TiDB Japanese documentation for TiDB 8.5 versions)

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

• This PR is translated from:
• Other reference link(s): i18n-ja-release-8.5: translate doc changes from pingcap/docs release-8.5 on 2026-10-01 #24132

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
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated TiDB 8.5.7 release notes with consistent Japanese terminology for pruning and partial indexes.
  • Clarified TiCDC support for parsing and replicating partial-index DDL, including WHERE clauses in table and index creation or alteration statements.

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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 053b6de and cac87d6.

📒 Files selected for processing (1)

• releases/release-8.5.7.md

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📝 Walkthrough

Walkthrough

The TiDB 8.5.7 release notes revise Japanese terminology in optimizer and foreign-key items. They also update the TiCDC partial-index DDL item and add details about parsing and replication support.

Changes

Release notes

Layer / File(s)	Summary
Release-note wording and TiCDC details releases/release-8.5.7.md	The optimizer and foreign-key items use revised terminology for partial indexes. The TiCDC item describes parsing and replication support for partial-index DDL, including WHERE clauses in CREATE TABLE, CREATE INDEX, and ALTER TABLE ... ADD INDEX.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to cac87

The release notes accurately describe the partial-index capability and use terminology consistent with the SQL reference and existing documentation. No actionable merge risk remains.

Architecture Summary

Architecture risk: 🔵 Low · up to cac87

The change affects 1 system.

Changed systems: releases

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

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

Before / after behavior

• observed — Modified behavior in releases/release-8.5.7.md: Updated the Japanese term describing removal of irrelevant indexes before cost estimation; the stated optimizer behavior is unchanged.
• observed — Modified behavior in releases/release-8.5.7.md: Reworded the existing TiCDC partial-index DDL replication item and added an item describing parsing and replication of partial-index DDL statements, including WHERE clauses in CREATE TABLE, CREATE INDEX, and ALTER TABLE ... ADD INDEX.
• observed — Modified behavior in releases/release-8.5.7.md: Changed the Japanese wording for the partial-index misuse described in the foreign-key enforcement bug fix; the stated defect and outcome are unchanged.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the terminology updates for partial indexes and pruning in the TiDB 8.5.7 Japanese release notes.
Description check	✅ Passed	The description explains the terminology changes, affected version branch, reference PR, AI involvement, and change categories. It satisfies the required sections; the custom version checkbox accurate…
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.

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Timeline:

• 2026-10-01 07:12:09.074769932 +0000 UTC m=+866454.299991029: ☑️ agreed by qiancai.