Mutating version of vcat for data frames

New to Julia
4

A DataFrame is (more or less) just a list of named vectors, and hcat(..., copycols=false) doesn’t copy the underlying vectors:

julia> df1, df2 = DataFrame(a = rand(10^6)), DataFrame(b = 1:10^6);

julia> @time df1 = hcat(df1, df2, copycols=false);
  0.000019 seconds (18 allocations: 1.406 KiB)
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