feat(#275): Added support for GroupByAppend in SelectDataset

[doug-martin]

No description provided.

[codecov]

Codecov Report

Merging #287 (8b32b9e) into master (61587fb) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #287   +/-   ##
=======================================
  Coverage   96.78%   96.78%           
=======================================
  Files          60       60           
  Lines        3324     3330    +6     
=======================================
+ Hits         3217     3223    +6     
  Misses         91       91           
  Partials       16       16           

Flag	Coverage Δ
unittests	96.78% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
exp/select_clauses.go	94.20% <100.00%> (+0.21%)	⬆️
select_dataset.go	100.00% <100.00%> (ø)

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