Refactor toString()

[acquamarin]

No description provided.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (851b567) 89.63% compared to head (988c398) 89.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2141      +/-   ##
==========================================
- Coverage   89.63%   89.63%   -0.01%     
==========================================
  Files         988      988              
  Lines       35729    35709      -20     
==========================================
- Hits        32027    32007      -20     
  Misses       3702     3702              

Files	Coverage Δ
src/common/type_utils.cpp	66.15% <100.00%> (+6.89%)	⬆️
src/include/common/type_utils.h	100.00% <100.00%> (ø)
...de/processor/operator/persistent/csv_file_writer.h	100.00% <ø> (ø)
.../processor/operator/persistent/csv_file_writer.cpp	83.87% <75.00%> (-1.21%)	⬇️

... and 1 file with indirect coverage changes

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