Remove duplicate code in column transformer

[lancelly]

As titled.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 50 lines in your changes missing coverage. Please review.

Project coverage is 39.49%. Comparing base (f2d24ff) to head (2a3b460).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...execution/relational/ColumnTransformerBuilder.java	0.00%	50 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14773      +/-   ##
============================================
+ Coverage     39.48%   39.49%   +0.01%     
  Complexity      193      193              
============================================
  Files          4482     4482              
  Lines        285212   285114      -98     
  Branches      35322    35322              
============================================
- Hits         112608   112601       -7     
+ Misses       172604   172513      -91     

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