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This is an automated cherry-pick of #22038

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@ti-chi-bot ti-chi-bot added do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. lgtm needs-1-more-lgtm Indicates a PR needs 1 more LGTM. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. type/bugfix This PR fixes a bug. type/cherry-pick-for-release-8.5 This PR is cherry-picked to release-8.5 from a source PR. labels Nov 10, 2025
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@Oreoxmt This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

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Summary of Changes

Hello @ti-chi-bot, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request, an automated cherry-pick, addresses a build failure stemming from incorrect markdown formatting in the Table of Contents. It successfully integrates a new documentation page that comprehensively describes TiDB's ANALYZE feature embedded within DDL statements. This feature is crucial for maintaining optimal query performance by ensuring that statistics for newly created or reorganized indexes are promptly collected, thereby preventing the optimizer from making suboptimal plan choices.

Highlights

  • Markdown Formatting Fix: Resolved a build failure by correcting markdown formatting in the Table of Contents (TOC.md), specifically by properly integrating a new documentation entry.
  • New Documentation: ANALYZE Embedded in DDL Statements: Introduced a new documentation page (ddl_embedded_analyze.md) that details the ANALYZE feature embedded in DDL statements.
  • Automatic Statistics Collection for Indexes: The new feature, controlled by the tidb_stats_update_during_ddl system variable, ensures automatic statistics collection for new or reorganized indexes (e.g., ADD INDEX, MODIFY COLUMN, CHANGE COLUMN) to prevent suboptimal query plans.
  • Version Introduction: The documented feature is introduced in TiDB v8.5.4 and v9.0.0, with changes applied to the v8.5 branch in this cherry-pick.
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@ti-chi-bot ti-chi-bot bot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels Nov 10, 2025
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Code Review

This pull request aims to fix a markdown formatting issue but has introduced merge conflict markers in TOC.md. These markers must be removed to prevent build failures. Additionally, I've found a minor formatting issue and a small opportunity for improving consistency in the new documentation file ddl_embedded_analyze.md. My review includes suggestions to address these points.

TOC.md Outdated
Comment on lines 1081 to 1084
<<<<<<< HEAD
=======
- [`ANALYZE` Embedded in DDL Statements](/ddl_embedded_analyze.md)
>>>>>>> 8e254a2344 (fix: correct markdown formatting to resolve build failure (#22038))

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critical

This change introduces merge conflict markers into the table of contents. This will cause rendering issues and likely break the build. Please resolve the conflict by removing the markers.

Suggested change
<<<<<<< HEAD
=======
- [`ANALYZE` Embedded in DDL Statements](/ddl_embedded_analyze.md)
>>>>>>> 8e254a2344 (fix: correct markdown formatting to resolve build failure (#22038))
- [`ANALYZE` Embedded in DDL Statements](/ddl_embedded_analyze.md)

When `tidb_stats_update_during_ddl` is `ON`, executing [`MODIFY COLUMN`](/sql-statements/sql-statement-modify-column.md) or [`CHANGE COLUMN`](/sql-statements/sql-statement-change-column.md) that reorganizes an index will also run an embedded `ANALYZE` operation after the Reorg phase completes. The mechanism is the same as for `ADD INDEX`:

- Start collecting statistics before the index becomes visible.
- If `ANALYZE` times out, [`MODIFY COLUMN`](/sql-statements/sql-statement-modify-column.md) and [`CHANGE COLUMN`](/sql-statements/sql-statement-change-column.md) stops waiting synchronously for `ANALYZE` to finish and continues the subsequent process, making the index visible earlier to users. This means that the index statistics will be updated when `ANALYZE` finishes asynchronously.

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low

For consistency with a similar sentence earlier in the document (line 50), I suggest rephrasing this part of the sentence.

Suggested change
- If `ANALYZE` times out, [`MODIFY COLUMN`](/sql-statements/sql-statement-modify-column.md) and [`CHANGE COLUMN`](/sql-statements/sql-statement-change-column.md) stops waiting synchronously for `ANALYZE` to finish and continues the subsequent process, making the index visible earlier to users. This means that the index statistics will be updated when `ANALYZE` finishes asynchronously.
- If `ANALYZE` times out, [`MODIFY COLUMN`](/sql-statements/sql-statement-modify-column.md) and [`CHANGE COLUMN`](/sql-statements/sql-statement-change-column.md) stops waiting synchronously for `ANALYZE` to finish and continues the subsequent process, making the index visible earlier to users. This means the index statistics will be updated after `ANALYZE` completes asynchronously.

+------------------------+---------+-----------+-----------------------+----------------------------------+
2 rows in set (0.005 sec)
```

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low

This empty line contains extra spaces, which can sometimes cause markdown rendering issues. It's best to remove them.

@Oreoxmt Oreoxmt changed the base branch from release-8.5 to feature/preview-v8.5.4 November 10, 2025 09:11
@Oreoxmt Oreoxmt changed the base branch from feature/preview-v8.5.4 to release-8.5 November 10, 2025 09:11
@Oreoxmt Oreoxmt changed the base branch from release-8.5 to feature/preview-v8.5.4 November 10, 2025 09:12
@Oreoxmt Oreoxmt force-pushed the cherry-pick-22038-to-release-8.5 branch from eeb79c1 to bc01e39 Compare November 10, 2025 09:15
@ti-chi-bot ti-chi-bot bot added size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. and removed size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels Nov 10, 2025
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Oreoxmt commented Nov 10, 2025

/unhold

@ti-chi-bot ti-chi-bot bot removed the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Nov 10, 2025
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Oreoxmt commented Nov 10, 2025

/approve

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ti-chi-bot bot commented Nov 10, 2025

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Oreoxmt

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@ti-chi-bot ti-chi-bot bot added the approved label Nov 10, 2025
@ti-chi-bot ti-chi-bot bot merged commit 7bc750f into pingcap:feature/preview-v8.5.4 Nov 10, 2025
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@ti-chi-bot ti-chi-bot bot deleted the cherry-pick-22038-to-release-8.5 branch November 10, 2025 09:23
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