Refactor optional column operations

[cchantep]

No description provided.

[codecov]

Codecov Report

Merging #696 (03ac449) into master (a27b04b) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #696      +/-   ##
==========================================
+ Coverage   95.00%   95.01%   +0.01%     
==========================================
  Files          65       65              
  Lines        1180     1183       +3     
  Branches       37       39       +2     
==========================================
+ Hits         1121     1124       +3     
  Misses         59       59              

Flag	Coverage Δ
2.12.16	95.01% <100.00%> (+0.01%)	⬆️
2.13.10	95.61% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...t/src/main/scala/frameless/functions/package.scala	95.83% <ø> (ø)
dataset/src/main/scala/frameless/TypedColumn.scala	100.00% <100.00%> (ø)

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[pomadchin]

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