import into support conflict resolution

[D3Hunter]

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[gemini-code-assist]

Summary of Changes

Hello @D3Hunter, 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 enhances the documentation for the IMPORT INTO SQL statement in TiDB, focusing on its conflict resolution capabilities. The updates clarify how primary key and unique index conflicts are automatically handled when using Global Sort in TiDB v8.5.5 and newer versions. The changes include detailed explanations, practical examples, and information on how to monitor and access data related to conflicted rows, ensuring users have a comprehensive understanding of this feature.

Highlights

• Updated IMPORT INTO Conflict Handling: The documentation for the IMPORT INTO statement has been updated to reflect new behavior regarding primary key and unique index conflicts. Specifically, for TiDB versions v8.5.5 and later, when using Global Sort, IMPORT INTO can now automatically handle these conflicts by removing conflicting rows.
• New Conflict Resolution Section: A new section titled 'Conflict resolution' has been added, providing detailed explanations and an example of how IMPORT INTO processes data with conflicts when Global Sort is enabled. This includes a demonstration of the IMPORT INTO command and the resulting table state.
• Conflicted Rows Information: Another new section, 'Conflicted rows info when using Global Sort', has been introduced. This section clarifies how the number of conflicted rows is displayed in the Result_Message column of SHOW IMPORT output and provides guidance on where to find the detailed conflicted row data in cloud storage.

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[gemini-code-assist]

Code Review

This pull request updates the IMPORT INTO documentation to include the new conflict resolution feature available with Global Sort. The changes are clear and provide good examples. I've made a few suggestions to improve wording, clarity, and consistency with the style guide. I also found a minor correctness issue in one of the examples and suggested a fix.

[alastori]

LGTM

[ti-chi-bot]

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