Optimize hash tiles fetch in MySQL storage implementation

[roger2hk]

#21

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.

Project coverage is 31.45%. Comparing base (46ec9c2) to head (b2cdda1).
Report is 18 commits behind head on main.

Files	Patch %	Lines
storage/mysql/mysql.go	0.00%	26 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   35.80%   31.45%   -4.35%     
==========================================
  Files          16       16              
  Lines        1363     1545     +182     
==========================================
- Hits          488      486       -2     
- Misses        801      985     +184     
  Partials       74       74              

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