Enhancement for #119

[doug-martin]

• [Added] Support for DISTINCT ON clauses How to SELECT DISTINCT on a single column? #119

[codecov]

Codecov Report

Merging #124 into master will decrease coverage by 0.06%.
The diff coverage is 89.13%.

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   87.52%   87.45%   -0.07%     
==========================================
  Files          47       47              
  Lines        3550     3556       +6     
==========================================
+ Hits         3107     3110       +3     
- Misses        383      386       +3     
  Partials       60       60

Impacted Files	Coverage Δ
sql_dialect_options.go	78.36% <100%> (+0.1%)	⬆️
dialect/mysql/mysql.go	100% <100%> (ø)	⬆️
exp/select_clauses.go	97.6% <100%> (-0.1%)	⬇️
dialect/sqlite3/sqlite3.go	100% <100%> (ø)	⬆️
select_dataset.go	91.93% <100%> (+0.06%)	⬆️
sql_dialect.go	86.06% <73.68%> (-0.24%)	⬇️

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