DataFrameX.jl

type DataFrame{N,D}
    data::D
end

immutable Field{s}
end

Field(s::Symbol) = Field{s}()

function DataFrame(;kwds...)
    names = Any[]
    data = Any[]
    types = Any[]
    for (n, d) in kwds
        push!(names,n)
        push!(data,d)
        push!(types,typeof(d))
    end
    N = tuple(names...)
    T = tuple(types...)
    DataFrame{N,T}(tuple(data...))
end

stagedfunction getindex{N,D,s}(d::DataFrame{N,D},f::Field{s})
    m = Dict(zip(N,1:length(N)))
    j = m[s]
    :(d.data[$j])
end
stagedfunction getindex{N,D,s}(d::DataFrame{N,D},i::Integer,f::Field{s})
    m = Dict(zip(N,1:length(N)))
    j = m[s]
    :(d.data[$j][i])
end
stagedfunction getindex{N,D}(d::DataFrame{N,D},i::Integer)
    Expr(:tuple,[:(d.data[$j][i]) for j in 1:length(D)]...)
end



d = DataFrame(aa=[1,2,3],bb=[4.0,5.0,6.0])
@code_typed d[Field(:aa)]
@code_typed d[Field(:bb)]

@code_typed d[1,Field(:aa)]
@code_typed d[1,Field(:bb)]

@code_typed d[1]

Copying this into REPL results in an error:

julia> d = DataFrame(aa=[1,2,3],bb=[4.0,5.0,6.0])
ERROR: TypeError: DataFrame: in parameter, expected Type{T}, got Tuple{DataType,DataType}
 in DataFrame at none:12