With the Fedora built of v0.4 (VERSION "0.4.0-dev") julia> using DataFrames
results in a long list of warnings.
More generally, will DataFrames and the new Nullable types go together?
Technically probably yes:
julia> df=DataFrame(A = Array(Nullable{Float64}, 5))
should work and initialize a DataFrame with one column and 5 rows.
But the NA type seems to become obsolete? The DataFrame would still be
handy for storing data selected from SQL tables!
