anti-join fails with BoundsError

[zlewko]

I would expect:

using JuliaDB
t1 = table( [1:5; 1:5], 11:20, 31:40, names = [:a, :b, :c])
t2= filter(row-> (row.a==3 && row.b==13) | (row.a==5 && row.b==20),t1)
join(t1,t2,how=:anti,lkey=(:a,:b), rkey=(:a,:b))

to essentially remove t1 from t1. However it results in: BoundsError: attempt to access 2-element Array{Int64,1} at index [6]

note: I am using #master