Fix sql.RawBytes corruption issue

[shogo82148]

Description

cancel() is intended to cancel the execution of rows.Next, but very rarely it cancels the execution of rows.Scan, causing rows.Scan to return an error, resulting in a test failure.

This pull request addresses this issue.

Checklist

• [ ] Code compiles correctly
• [ ] Created tests which fail without the change (if possible)
• [ ] All tests passing
• [ ] Extended the README / documentation, if necessary
• [ ] Added myself / the copyright holder to the AUTHORS file

Summary by CodeRabbit

• Bug Fixes
  • Improved the reliability of the test suite by ensuring proper handling of row existence checks before scanning, preventing potential test failures.

[coderabbitai[bot]]

Walkthrough

The changes involve updating a test function in driver_test.go to enhance its robustness. The test now includes a preliminary check to ensure that rows are present before proceeding with scanning operations. Additionally, the management of the rows.Close() call has been optimized within the function's logic, ensuring that resources are handled correctly and potential issues with unclosed rows are mitigated.

Changes

File Path	Change Summary
driver_test.go	Added a check for row existence and reorganized the rows.Close() call within the TestRawBytesAreNotModified function.

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[coveralls]

coverage: 82.627%. remained the same when pulling 015971fb068a6dccafd0042ebcf26c5b649e8fae on shogo82148:fix-raw-bytes-corruption-issue into fc589cbaba22032382488393c72b9b3b5366917c on go-sql-driver:master.