Revert "support datavalue (JuliaArrays#40)" (JuliaArrays#42)

This reverts commit de7eafb.

Author: Pietro Vertechi

src/StructArrays.jl

@@ -20,9 +20,6 @@ function __init__()
         isstringarray(::WeakRefStrings.StringArray) = true
         default_array(::Type{T}, d) where {T<:Union{AbstractString, Missing}} = WeakRefStrings.StringArray{T}(d)
     end
-    Requires.@require DataValues="e7dc6d0d-1eca-5fa6-8ad6-5aecde8b7ea5" begin
-        Base.@pure SkipConstructor(::Type{<:DataValues.DataValue}) = true
-    end
 end
 
 end # module

test/REQUIRE

@@ -1,4 +1,3 @@
 Tables
 PooledArrays
 WeakRefStrings
-DataValues

test/runtests.jl

@@ -1,7 +1,6 @@
 using StructArrays
 using StructArrays: LazyRow
 import Tables, PooledArrays, WeakRefStrings
-using DataValues: DataValue
 using Test
 
 # write your own tests here
@@ -409,13 +408,3 @@ end
     @test v.a == [i for i in 1:3, j in 1:4]
     @test v.b == [j for i in 1:3, j in 1:4]
 end
-
-@testset "datavalues" begin
-    a = DataValue(2)
-    b = DataValue{Float64}()
-    s = StructArray(i for i in (a, b))
-    @test propertynames(s) == (:hasvalue, :value)
-    @test s.hasvalue == [true, false]
-    @test s.value isa Vector{Real}
-    @test s.value[1] == 2
-end