fix #272

[HarrisChu]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Close #272

Description:

How do you solve it?

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

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.81 🎉

Comparison is base (3ed8926) 61.30% compared to head (dbf6afd) 62.12%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
+ Coverage   61.30%   62.12%   +0.81%     
==========================================
  Files           9        9              
  Lines        2308     2305       -3     
==========================================
+ Hits         1415     1432      +17     
+ Misses        748      734      -14     
+ Partials      145      139       -6     

Impacted Files	Coverage Δ
connection_pool.go	81.46% <100.00%> (+2.72%)	⬆️
session.go	50.80% <100.00%> (+3.10%)	⬆️

... and 1 file with indirect coverage changes

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[Aiee]

Good job!