sql-statement-create-binding: add note about truncation (#21825)

[ti-chi-bot]

This is an automated cherry-pick of #21825

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[gemini-code-assist]

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 enhances the TiDB documentation by clarifying a specific edge case related to SQL statement binding. It introduces a new section explaining how CREATE BINDING ... FROM HISTORY USING PLAN DIGEST can fail if the underlying SQL statement is truncated due to length limitations, and offers a direct solution by adjusting a system variable. This change aims to improve user experience by preemptively addressing a common troubleshooting scenario.

Highlights

• Documentation Update: Added a new section to the CREATE BINDING SQL statement documentation, specifically addressing potential issues with SQL statement truncation.
• Troubleshooting Guidance: Provided instructions on how to resolve binding failures caused by truncated SQL statements, advising users to increase the tidb_stmt_summary_max_sql_length system variable.

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[gemini-code-assist]

Code Review

This pull request adds a helpful note about a potential failure when creating a binding from history due to SQL statement truncation. I've suggested a minor wording change to improve readability by breaking up a long sentence, making the information easier for users to understand.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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