Ambiguity with open(::Function, ::DataSet)

[mbauman]

julia> open(io->CSV.read(io, DataFrame), dataset("us_counties"))
ERROR: MethodError: open(::var"#13#14", ::DataSet) is ambiguous. Candidates:
  open(f::Function, args...; kwargs...) in Base at io.jl:322
  open(as_type, conf::DataSet) in DataSets at /home/jrun/data/.julia/packages/DataSets/ssxgC/src/DataSets.jl:278
Possible fix, define
  open(::Function, ::DataSet)
Stacktrace:
 [1] top-level scope at REPL[48]:1

[c42f]

Right, this version of open() isn't defined - instead, you can use open(func, T, dataset).

In your case open(io->CSV.read(io, DataFrame), IO, dataset("us_counties"))

Possibly we could define it; we'd need some concept of "default data type" T to open as and pass to the user's Function. For Blob that could be IO, but it could also be a data buffer like Vector{UInt8}. Or maybe it should just open as Blob to keep it lazy?