GroupedDataFrame combine unique non-key values

General Usage
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2

There is no @groupby macro. .

I guess you want the following?


julia> combine(groupby(check, [:a, :b]), :c => Ref ∘ unique => :ccat)
2×3 DataFrame
 Row │ a      b       ccat   
     │ Int64  String  Array… 
─────┼───────────────────────
   1 │     1  a       [0]
   2 │     2  b       [1, 0]
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