hotfix: fix the field index conflict inside the method Scan of ResultSet

[haoxins]

This is hotfix because there is a variable overriding of the i :)

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

[CLAassistant]

All committers have signed the CLA.

[haoxins]

cc @Nicole00 @wey-gu
tested in my service and will add more tests in the future

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (3fe0bb1) 63.37% compared to head (c6c2d6b) 63.37%.

Files	Patch %	Lines
result_set.go	87.50%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #305   +/-   ##
=======================================
  Coverage   63.37%   63.37%           
=======================================
  Files           9        9           
  Lines        2452     2452           
=======================================
  Hits         1554     1554           
  Misses        768      768           
  Partials      130      130           

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[Nicole00]

LGTM