DataFrames.jl non-working unstack() example

example.jl

using DataFrames

ids = rand(15000:25000, 1600)
ids = unique(ids)
ids = String[string("f",x) for x in ids]
keys = 1:200
keys = String[string("k",x) for x in keys]

temp = join(DataFrame(id = ids), DataFrame(key = keys), kind = :cross)
keepflag = rand(size(temp,1))
keepflag = keepflag .> .8
temp = temp[keepflag, :]
temp[:v] = 1

temp2 = unstack(temp, :key, :v)
temp3 = unstack(temp, :id, :key, :v)

s0 = size(unique(ids))
s1 = size(unique(temp[:id]))
s2 = size(unique(temp2[:id]))
s3 = size(unique(temp3[:key]))