Remove unnecessary boxing in ResultSetImpl

[ningpp]

No description provided.

[mysql-oca-bot]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at https://oca.opensource.oracle.com/
Please make sure to include your MySQL bug system user (email) in the returned form.
Thanks

[ningpp]

i signed the Oracle Contribution Agreement (OCA). what's next?

[mysql-admin]

@ningpp Sorry for the delay - we'll check the status of the OCA and follow up
Thanks for contributing to MySQL
==Omer

[mysql-oca-bot]

Hi, thank you for your contribution. Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
"I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it."
Thanks

[mysql-admin]

@ningpp - sorry for the delay in processing your OCA. It has been processed. Please confirm the code is under the OCA as requested by the bot

Thanks
==Omer

[ningpp]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for your contribution. Your code has been assigned to an internal queue. Please follow
bug http://bugs.mysql.com/bug.php?id=106171 for updates.
Thanks