How to convert a dataframe into a 1-D vector, line by line?

General Usage
,
2 
julia> v = Int[]
Int64[]

julia> for i in eachindex(df.a, df.b)
           push!(v, df.a[i])
           push!(v, df.b[i])
       end

julia> v
8-element Vector{Int64}:
 1
 5
 2
 6
 3
 7
 4
 8
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