Converting to DataFrame fails for NamedTuple[]

[itsdfish]

I am submitting this issue based on a discussion on Discourse. It is possible to convert an Array of NamedTuples to a DataFrame if it is initialized as Any[]. However, this is not possible if the array is initialized as NamedTuple[]. The code below demonstrates the behavior.

using DataFrames
#Works
x1 = [(x=rand(),y=rand([:a,:b])) for i in 1:10]
d1 = DataFrame(x1)

#Works
x2 = Any[(x=rand(),y=rand([:a,:b])) for i in 1:10]
d2 = DataFrame(x2)

#Does not work
x3 = NamedTuple[(x=rand(),y=rand([:a,:b])) for i in 1:10]
d3 = DataFrame(x3)

ERROR: MethodError: no method matching Tables.Schema(::Type{NamedTuple})
Closest candidates are:
  Tables.Schema(::Any, ::Nothing) at /home/dfish/.julia/packages/Tables/zyTIO/src/Tables.jl:159
  Tables.Schema(::Any, ::Any) at /home/dfish/.julia/packages/Tables/zyTIO/src/Tables.jl:160
  Tables.Schema(::Tuple{Vararg{Symbol,N} where N}, ::Type{T<:Tuple}) where T<:Tuple at /home/dfish/.julia/packages/Tables/zyTIO/src/Tables.jl:157
  ...
Stacktrace:
 [1] schema(::Tables.DataValueUnwrapper{Array{NamedTuple,1}}) at /home/dfish/.julia/packages/Tables/zyTIO/src/query.jl:29
 [2] columns at /home/dfish/.julia/packages/Tables/zyTIO/src/fallbacks.jl:152 [inlined]
 [3] DataFrame(::Array{NamedTuple,1}) at /home/dfish/.julia/packages/DataFrames/z2XOB/src/other/tables.jl:45
 [4] top-level scope at none:0

As pointed out by the other poster, x3 is a table, but is not handled by the interface.

Tables.istable(typeof(x3))

[nalimilan]

Sounds like a bug in Tables.jl to me. @quinnj?

[davidanthoff]

This definitely used to work at some point...

[quinnj]

I'll take a look at this today.

[Nosferican]

Any update on this?