br: handle special character in SQL (#37486)

[ti-srebot]

cherry-pick #37486 to release-6.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/37639

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git push git@github.com:ti-srebot/tidb.git pr/37639:release-6.1-aab394fb420a

---

Signed-off-by: Gaoming Zhang zhanggaoming028@gmail.com

What problem does this PR solve?

Issue Number: close #37469

Problem Summary:
In SQL backup/restore if sk has special character (+), we will encounter the error.

What is changed and how it works?

Replace the '+' to %2B in the storage URL.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3pointer
• joccau

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[ti-srebot]

/run-all-tests

[ti-srebot]

@MoCuishle28 you're already a collaborator in bot's repo.

[3pointer]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 6118d7c

[ti-chi-bot]

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