/
cat.jl
480 lines (433 loc) · 21.1 KB
/
cat.jl
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module TestCat
using Test, Random, DataFrames, CategoricalArrays
const ≅ = isequal
@testset "hcat" begin
nvint = [1, 2, missing, 4]
nvstr = ["one", "two", missing, "four"]
df2 = DataFrame([nvint, nvstr], :auto)
df3 = DataFrame([nvint], :auto)
df4 = DataFrame([1:4 1:4], [:x1, :x2])
df5 = DataFrame([Union{Int, Missing}[1, 2, 3, 4], nvstr], :auto)
ref_df = copy(df3)
dfh = hcat(df3, df4, makeunique=true)
@test ref_df ≅ df3 # make sure that df3 is not mutated by hcat
@test size(dfh, 2) == 3
@test names(dfh) ≅ ["x1", "x1_1", "x2"]
@test dfh[!, :x1] ≅ df3[!, :x1]
@test dfh ≅ DataFrames.hcat!(DataFrame(), df3, df4, makeunique=true)
dfa = DataFrame(a=[1, 2])
dfb = DataFrame(b=[3, missing])
@test hcat(dfa, dfb) ≅ [dfa dfb]
dfh3 = hcat(df3, df4, df5, makeunique=true)
@test names(dfh3) == ["x1", "x1_1", "x2", "x1_2", "x2_1"]
@test dfh3 ≅ hcat(dfh, df5, makeunique=true)
@test dfh3 ≅ DataFrames.hcat!(DataFrame(), df3, df4, df5, makeunique=true)
@test df2 ≅ DataFrames.hcat!(df2, makeunique=true)
end
@testset "hcat: copying" begin
df = DataFrame(x=1:3)
@test hcat(df)[!, 1] == df[!, 1]
@test hcat(df)[!, 1] !== df[!, 1]
hdf = hcat(df, df, makeunique=true)
@test hdf[!, 1] == df[!, 1]
@test hdf[!, 1] !== df[!, 1]
@test hdf[!, 2] == df[!, 1]
@test hdf[!, 2] !== df[!, 1]
@test hdf[!, 1] == hdf[!, 2]
@test hdf[!, 1] !== hdf[!, 2]
hdf = hcat(df, df, df, makeunique=true)
@test hdf[!, 1] == df[!, 1]
@test hdf[!, 1] !== df[!, 1]
@test hdf[!, 2] == df[!, 1]
@test hdf[!, 2] !== df[!, 1]
@test hdf[!, 3] == df[!, 1]
@test hdf[!, 3] !== df[!, 1]
@test hdf[!, 1] == hdf[!, 2]
@test hdf[!, 1] !== hdf[!, 2]
@test hdf[!, 1] == hdf[!, 3]
@test hdf[!, 1] !== hdf[!, 3]
@test hdf[!, 2] == hdf[!, 3]
@test hdf[!, 2] !== hdf[!, 3]
end
@testset "hcat ::AbstractDataFrame" begin
df = DataFrame(A=repeat('A':'C', inner=4), B=1:12)
gd = groupby(df, :A)
answer = DataFrame(A=fill('A', 4), B=1:4, A_1='B', B_1=5:8, A_2='C', B_2=9:12)
@test hcat(gd..., makeunique=true) == answer
answer = answer[:, 1:4]
@test hcat(gd[1], gd[2], makeunique=true) == answer
@test_throws MethodError hcat("a", df, makeunique=true)
@test_throws MethodError hcat(df, "a", makeunique=true)
end
@testset "hcat: copycols" begin
df1 = DataFrame(a=1:3)
df2 = DataFrame(b=1:3)
dfv = view(df2, :, :)
x = [1, 2, 3]
df3 = hcat(df1)
@test df3 == df1
@test df3.a !== df1.a
df3 = hcat(df1, copycols=true)
@test df3 == df1
@test df3.a !== df1.a
df3 = hcat(df1, copycols=false)
@test df3 == df1
@test df3.a === df1.a
df3 = hcat(df1, df2)
@test propertynames(df3) == [:a, :b]
@test df3.a == df1.a
@test df3.b == df2.b
@test df3.a !== df1.a
@test df3.b !== df2.b
df3 = hcat(df1, df2, copycols=true)
@test propertynames(df3) == [:a, :b]
@test df3.a == df1.a
@test df3.b == df2.b
@test df3.a !== df1.a
@test df3.b !== df2.b
df3 = hcat(df1, df2, copycols=false)
@test propertynames(df3) == [:a, :b]
@test df3.a === df1.a
@test df3.b === df2.b
df3 = hcat(df1, dfv)
@test propertynames(df3) == [:a, :b]
@test df3.a == df1.a
@test df3.b == df2.b
@test df3.a !== df1.a
@test df3.b !== df2.b
df3 = hcat(df1, dfv, copycols=true)
@test propertynames(df3) == [:a, :b]
@test df3.a == df1.a
@test df3.b == df2.b
@test df3.a !== df1.a
@test df3.b !== df2.b
df3 = hcat(df1, dfv, copycols=false)
@test propertynames(df3) == [:a, :b]
@test df3.a === df1.a
@test df3.b === dfv.b
end
@testset "vcat" begin
missing_df = DataFrame()
df = DataFrame([3.0 2.0 2.0
2.0 2.0 2.0
3.0 1.0 2.0
3.0 3.0 3.0], :auto)
df[!, 3] = Int.(df[!, 3])
@test vcat(missing_df) == DataFrame()
@test vcat(missing_df, missing_df) == DataFrame()
@test vcat(missing_df) == DataFrame()
@test vcat(missing_df, missing_df) == DataFrame()
@test vcat(missing_df, df) == df
@test vcat(df, missing_df) == df
@test eltype.(eachcol(vcat(df, df))) == Type[Float64, Float64, Int]
@test size(vcat(df, df)) == (size(df, 1) * 2, size(df, 2))
res = vcat(df, df)
@test res[1:size(df, 1), :] == df
@test res[(1+size(df, 1)):end, :] == df
res = vcat(df, df, df)
@test eltype.(eachcol(res)) == Type[Float64, Float64, Int]
@test size(res) == (size(df, 1) * 3, size(df, 2))
s = size(df, 1)
for i in 1:3
@test res[1+(i-1)*s:i*s, :] == df
end
alt_df = deepcopy(df)
@test vcat(df, alt_df) == DataFrame([[3.0, 2.0, 3.0, 3.0, 3.0, 2.0, 3.0, 3.0],
[2.0, 2.0, 1.0, 3.0, 2.0, 2.0, 1.0, 3.0],
[2, 2, 2, 3, 2, 2, 2, 3]], :auto)
# Don't fail on non-matching types
df[!, 1] = zeros(Int, nrow(df))
@test vcat(df, alt_df) == DataFrame([[0.0, 0.0, 0.0, 0.0, 3.0, 2.0, 3.0, 3.0],
[2.0, 2.0, 1.0, 3.0, 2.0, 2.0, 1.0, 3.0],
[2, 2, 2, 3, 2, 2, 2, 3]], :auto)
df1 = DataFrame(A=Int[], B=Float64[])
df2 = DataFrame(B=1.0, A=1)
@test vcat(df2, df1, df2, df1) == vcat(df2, df2)
df = DataFrame(A=1:5, B=11:15, C=21:25)
@test vcat(view(df, 1:2, :), view(df, 3:5, [3, 2, 1])) == df
@test_throws ArgumentError view(df, 1:2, [1, 2, 3, 1, 2, 3])
@test_throws ArgumentError view(df, 3:5, [3, 2, 1, 1, 2, 3])
end
@testset "vcat copy" begin
df = DataFrame(x=1:3)
@test vcat(df)[!, 1] == df[!, 1]
@test vcat(df)[!, 1] !== df[!, 1]
end
@testset "vcat >2 args" begin
empty_dfs = [DataFrame(), DataFrame(), DataFrame()]
@test vcat(empty_dfs...) == reduce(vcat, empty_dfs) == DataFrame()
@test reduce(vcat, Tuple(empty_dfs)) == DataFrame()
df = DataFrame(x=trues(1), y=falses(1))
dfs = [df, df, df]
@test vcat(dfs...) == reduce(vcat, dfs) == DataFrame(x=trues(3), y=falses(3))
@test reduce(vcat, Tuple(dfs)) == DataFrame(x=trues(3), y=falses(3))
end
@testset "vcat mixed coltypes" begin
df = vcat(DataFrame([[1]], [:x]), DataFrame([[1.0]], [:x]))
@test df == DataFrame([[1.0, 1.0]], [:x])
@test typeof.(eachcol(df)) == [Vector{Float64}]
df = vcat(DataFrame([[1]], [:x]), DataFrame([["1"]], [:x]))
@test df == DataFrame([[1, "1"]], [:x])
@test typeof.(eachcol(df)) == [Vector{Any}]
df = vcat(DataFrame([Union{Missing, Int}[1]], [:x]), DataFrame([[1]], [:x]))
@test df == DataFrame([[1, 1]], [:x])
@test typeof.(eachcol(df)) == [Vector{Union{Missing, Int}}]
df = vcat(DataFrame([CategoricalArray([1])], [:x]), DataFrame([[1]], [:x]))
@test df == DataFrame([[1, 1]], [:x])
@test df.x isa Vector{Int}
df = vcat(DataFrame([CategoricalArray([1])], [:x]),
DataFrame([Union{Missing, Int}[1]], [:x]))
@test df == DataFrame([[1, 1]], [:x])
@test df.x isa Vector{Union{Int, Missing}}
df = vcat(DataFrame([CategoricalArray([1])], [:x]),
DataFrame([CategoricalArray{Union{Int, Missing}}([1])], [:x]))
@test df == DataFrame([[1, 1]], [:x])
@test df.x isa CategoricalVector{Union{Int, Missing}}
df = vcat(DataFrame([Union{Int, Missing}[1]], [:x]),
DataFrame([["1"]], [:x]))
@test df == DataFrame([[1, "1"]], [:x])
@test typeof.(eachcol(df)) == [Vector{Any}]
df = vcat(DataFrame([CategoricalArray([1])], [:x]),
DataFrame([CategoricalArray([1.0])], [:x]))
@test df == DataFrame([[1.0, 1.0]], [:x])
@test df.x isa CategoricalVector{Float64}
@test levels(df.x) == [1.0]
df = vcat(DataFrame([trues(1)], [:x]), DataFrame([[false]], [:x]))
@test df == DataFrame([[true, false]], [:x])
@test typeof.(eachcol(df)) == [Vector{Bool}]
end
@testset "vcat out of order" begin
df1 = DataFrame(A=1:3, B=4:6, C=7:9)
df2 = DataFrame([2x for x in eachcol(df1)], reverse(names(df1)))
@test vcat(df1, df2) == DataFrame(A=[1, 2, 3, 14, 16, 18],
B=[4, 5, 6, 8, 10, 12],
C=[7, 8, 9, 2, 4, 6])
@test vcat(df1, df1, df2) == DataFrame(A=[1, 2, 3, 1, 2, 3, 14, 16, 18],
B=[4, 5, 6, 4, 5, 6, 8, 10, 12],
C=[7, 8, 9, 7, 8, 9, 2, 4, 6])
@test vcat(df1, df2, df2) == DataFrame(A=[1, 2, 3, 14, 16, 18, 14, 16, 18],
B=[4, 5, 6, 8, 10, 12, 8, 10, 12],
C=[7, 8, 9, 2, 4, 6, 2, 4, 6])
@test vcat(df2, df1, df2) == DataFrame(C=[2, 4, 6, 7, 8, 9, 2, 4, 6],
B=[8, 10, 12, 4, 5, 6, 8, 10, 12],
A=[14, 16, 18, 1, 2, 3, 14, 16, 18])
@test size(vcat(df1, df1, df1, df2, df2, df2)) == (18, 3)
df3 = df1[:, [1, 3, 2]]
res = vcat(df1, df1, df1, df2, df2, df2, df3, df3, df3, df3)
@test res == reduce(vcat, [df1, df1, df1, df2, df2, df2, df3, df3, df3, df3])
@test res == reduce(vcat, (df1, df1, df1, df2, df2, df2, df3, df3, df3, df3))
@test size(res) == (30, 3)
@test res[1:3, :] == df1
@test res[4:6, :] == df1
@test res[7:9, :] == df1
@test res[10:12, :] == df2[:, names(res)]
@test res[13:15, :] == df2[:, names(res)]
@test res[16:18, :] == df2[:, names(res)]
@test res[19:21, :] == df3[:, names(res)]
@test res[22:24, :] == df3[:, names(res)]
@test res[25:27, :] == df3[:, names(res)]
df1 = DataFrame(A=1, B=2)
df2 = DataFrame(B=12, A=11)
df3 = DataFrame(A=[1, 11], B=[2, 12])
@test [df1; df2] == df3 == reduce(vcat, [df1, df2])
@test df3 == reduce(vcat, (df1, df2))
@test_throws ArgumentError vcat(df1, df2, cols=:orderequal)
@test_throws ArgumentError reduce(vcat, [df1, df2], cols=:orderequal)
end
@testset "vcat with cols=:union" begin
df1 = DataFrame(A=1:3, B=4:6)
df2 = DataFrame(A=7:9)
df3 = DataFrame(B=4:6, A=1:3)
@test vcat(df1, df2; cols = :union) ≅
DataFrame(A=[1, 2, 3, 7, 8, 9],
B=[4, 5, 6, missing, missing, missing])
@test vcat(df1, df2; cols = :union) ≅ reduce(vcat, [df1, df2]; cols = :union)
@test vcat(df1, df2; cols = :union) ≅ reduce(vcat, (df1, df2); cols = :union)
@test vcat(df1, df2, df3; cols = :union) ≅
DataFrame(A=[1, 2, 3, 7, 8, 9, 1, 2, 3],
B=[4, 5, 6, missing, missing, missing, 4, 5, 6])
@test vcat(df1, df2, df3; cols = :union) ≅ reduce(vcat, [df1, df2, df3]; cols = :union)
@test vcat(df1, df2, df3; cols = :union) ≅ reduce(vcat, (df1, df2, df3); cols = :union)
end
@testset "vcat with cols=:intersect" begin
df1 = DataFrame(A=1:3, B=4:6)
df2 = DataFrame(A=7:9)
df3 = DataFrame(A=10:12, C=13:15)
@test vcat(df1, df2; cols = :intersect) ≅ DataFrame(A=[1, 2, 3, 7, 8, 9])
@test vcat(df1, df2; cols = :intersect) ≅ reduce(vcat, [df1, df2]; cols = :intersect)
@test vcat(df1, df2; cols = :intersect) ≅ reduce(vcat, (df1, df2); cols = :intersect)
@test vcat(df1, df2, df3; cols = :intersect) ≅ DataFrame(A=[1, 2, 3, 7, 8, 9,
10, 11, 12])
@test vcat(df1, df2, df3; cols = :intersect) ≅ reduce(vcat, [df1, df2, df3]; cols = :intersect)
@test vcat(df1, df2, df3; cols = :intersect) ≅ reduce(vcat, (df1, df2, df3); cols = :intersect)
end
@testset "vcat with cols::Vector" begin
df1 = DataFrame(A=1:3, B=4:6)
df2 = DataFrame(A=7:9)
df3 = DataFrame(A=10:12, C=13:15)
@test vcat(df1, df2; cols = [:A, :B, :C]) ≅
DataFrame(A=[1, 2, 3, 7, 8, 9],
B=[4, 5, 6, missing, missing, missing],
C=[missing, missing, missing, missing, missing, missing])
@test vcat(df1, df2; cols = [:A, :B, :C]) ≅
reduce(vcat, [df1, df2]; cols = [:A, :B, :C])
@test vcat(df1, df2; cols = [:A, :B, :C]) ≅
reduce(vcat, (df1, df2); cols = [:A, :B, :C])
@test vcat(df1, df2, df3; cols = [:A, :B, :C]) ≅
DataFrame(A=[1, 2, 3, 7, 8, 9, 10, 11, 12],
B=[4, 5, 6, missing, missing, missing, missing, missing, missing],
C=[missing, missing, missing, missing, missing, missing, 13, 14, 15])
@test vcat(df1, df2, df3; cols = [:A, :B, :C]) ≅
reduce(vcat, [df1, df2, df3]; cols = [:A, :B, :C])
@test vcat(df1, df2, df3; cols = [:A, :B, :C]) ≅
reduce(vcat, (df1, df2, df3); cols = [:A, :B, :C])
df1 = DataFrame(A=Int[], B=Float64[])
df2 = DataFrame(B=1.0, A=1)
@test vcat(df1, df2, df1, cols=[:A, :C, :B]) ≅ DataFrame(A=1, C=missing, B=1.0)
@test vcat(df1, df2, df1, cols=[:A, :C, :B]) ≅
reduce(vcat, [df1, df2, df1], cols=[:A, :C, :B])
@test vcat(df1, df2, df1, cols=[:A, :C, :B]) ≅
reduce(vcat, (df1, df2, df1), cols=[:A, :C, :B])
@test vcat(df1, df2, df2, cols=[:C]) ≅ DataFrame(C=[missing, missing])
@test vcat(df1, df2, df2, cols=[:C]) ≅ reduce(vcat, [df1, df2, df2], cols=[:C])
@test vcat(df1, df2, df2, cols=[:C]) ≅ reduce(vcat, (df1, df2, df2), cols=[:C])
@test_throws ArgumentError vcat(df1, df2, df2, cols=[:C, :C])
@test_throws ArgumentError reduce(vcat, [df1, df2, df2], cols=[:C, :C])
@test_throws ArgumentError reduce(vcat, (df1, df2, df2), cols=[:C, :C])
df1 = DataFrame(A=1:3, B=4:6)
df2 = DataFrame(A=7:9)
df3 = DataFrame(A=10:12, C=13:15)
@test vcat(df1, df2; cols = ["A", "B", "C"]) ≅
DataFrame(A=[1, 2, 3, 7, 8, 9],
B=[4, 5, 6, missing, missing, missing],
C=[missing, missing, missing, missing, missing, missing])
@test vcat(df1, df2; cols = ["A", "B", "C"]) ≅
reduce(vcat, [df1, df2]; cols = ["A", "B", "C"])
@test vcat(df1, df2; cols = ["A", "B", "C"]) ≅
reduce(vcat, (df1, df2); cols = ["A", "B", "C"])
@test vcat(df1, df2, df3; cols = ["A", "B", "C"]) ≅
DataFrame(A=[1, 2, 3, 7, 8, 9, 10, 11, 12],
B=[4, 5, 6, missing, missing, missing, missing, missing, missing],
C=[missing, missing, missing, missing, missing, missing, 13, 14, 15])
@test vcat(df1, df2, df3; cols = ["A", "B", "C"]) ≅
reduce(vcat, [df1, df2, df3]; cols = ["A", "B", "C"])
@test vcat(df1, df2, df3; cols = ["A", "B", "C"]) ≅
reduce(vcat, (df1, df2, df3); cols = ["A", "B", "C"])
df1 = DataFrame(A=Int[], B=Float64[])
df2 = DataFrame(B=1.0, A=1)
@test vcat(df1, df2, df1, cols=["A", "C", "B"]) ≅ DataFrame(A=1, C=missing, B=1.0)
@test vcat(df1, df2, df1, cols=["A", "C", "B"]) ≅
reduce(vcat, [df1, df2, df1], cols=["A", "C", "B"])
@test vcat(df1, df2, df1, cols=["A", "C", "B"]) ≅
reduce(vcat, (df1, df2, df1), cols=["A", "C", "B"])
@test vcat(df1, df2, df2, cols=["C"]) ≅ DataFrame(C=[missing, missing])
@test vcat(df1, df2, df2, cols=["C"]) ≅ reduce(vcat, [df1, df2, df2], cols=["C"])
@test vcat(df1, df2, df2, cols=["C"]) ≅ reduce(vcat, (df1, df2, df2), cols=["C"])
@test_throws ArgumentError vcat(df1, df2, df2, cols=[:C, :C])
@test_throws ArgumentError reduce(vcat, [df1, df2, df2], cols=["C", "C"])
@test_throws ArgumentError reduce(vcat, (df1, df2, df2), cols=["C", "C"])
end
@testset "vcat thrown exceptions" begin
df1 = DataFrame(A=1:3, B=1:3)
df2 = DataFrame(A=1:3)
# wrong cols argument
@test_throws ArgumentError vcat(df1, df1, cols=:unions)
# right missing 1 column
err = @test_throws ArgumentError vcat(df1, df2)
@test err.value.msg == "column(s) B are missing from argument(s) 2"
# left missing 1 column
err = @test_throws ArgumentError vcat(df2, df1)
@test err.value.msg == "column(s) B are missing from argument(s) 1"
# multiple missing 1 column
err1 = @test_throws ArgumentError vcat(df1, df2, df2, df2, df2, df2)
err2 = @test_throws ArgumentError reduce(vcat, [df1, df2, df2, df2, df2, df2])
@test_throws ArgumentError reduce(vcat, (df1, df2, df2, df2, df2, df2))
@test err1.value.msg == err2.value.msg ==
"column(s) B are missing from argument(s) 2, 3, 4, 5 and 6"
# argument missing >1 columns
df1 = DataFrame(A=1:3, B=1:3, C=1:3, D=1:3, E=1:3)
err = @test_throws ArgumentError vcat(df1, df2)
@test err.value.msg == "column(s) B, C, D and E are missing from argument(s) 2"
# >1 arguments missing >1 columns
err = @test_throws ArgumentError vcat(df1, df2, df2, df2, df2)
@test err.value.msg == "column(s) B, C, D and E are missing from argument(s) 2, 3, 4 and 5"
# missing columns throws error
df1 = DataFrame(A=1, B=1)
df2 = DataFrame(A=1)
df3 = DataFrame(B=1, A=1)
err = @test_throws ArgumentError vcat(df1, df2, df3)
@test err.value.msg == "column(s) B are missing from argument(s) 2"
# unique columns for both sides
df1 = DataFrame(A=1, B=1, C=1, D=1)
df2 = DataFrame(A=1, C=1, D=1, E=1, F=1)
err = @test_throws ArgumentError vcat(df1, df2)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1, " *
"and column(s) B are missing from argument(s) 2"
err = @test_throws ArgumentError vcat(df1, df1, df2, df2)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1 and 2, " *
"and column(s) B are missing from argument(s) 3 and 4"
df3 = DataFrame(A=1, B=1, C=1, D=1, E=1)
err = @test_throws ArgumentError vcat(df1, df2, df3)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1, " *
"column(s) B are missing from argument(s) 2, " *
"and column(s) F are missing from argument(s) 3"
err = @test_throws ArgumentError vcat(df1, df1, df2, df2, df3, df3)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1 and 2, " *
"column(s) B are missing from argument(s) 3 and 4, " *
"and column(s) F are missing from argument(s) 5 and 6"
err = @test_throws ArgumentError vcat(df1, df1, df1, df2, df2, df2, df3, df3, df3)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1, 2 and 3, " *
"column(s) B are missing from argument(s) 4, 5 and 6, " *
"and column(s) F are missing from argument(s) 7, 8 and 9"
# df4 is a superset of names found in all other DataFrames and won't be shown in error
df4 = DataFrame(A=1, B=1, C=1, D=1, E=1, F=1)
err = @test_throws ArgumentError vcat(df1, df2, df3, df4)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1, " *
"column(s) B are missing from argument(s) 2, " *
"and column(s) F are missing from argument(s) 3"
err = @test_throws ArgumentError vcat(df1, df1, df2, df2, df3, df3, df4, df4)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1 and 2, " *
"column(s) B are missing from argument(s) 3 and 4, " *
"and column(s) F are missing from argument(s) 5 and 6"
err = @test_throws ArgumentError vcat(df1, df1, df1, df2, df2, df2,
df3, df3, df3, df4, df4, df4)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1, 2 " *
"and 3, column(s) B are missing from argument(s) 4, 5 " *
"and 6, and column(s) F are missing from argument(s) 7, 8 and 9"
err = @test_throws ArgumentError vcat(df1, df2, df3, df4, df1, df2,
df3, df4, df1, df2, df3, df4)
@test err.value.msg == "column(s) E and F are missing from argument(s) 1, 5 and 9, " *
"column(s) B are missing from argument(s) 2, 6 and 10, " *
"and column(s) F are missing from argument(s) 3, 7 and 11"
end
@testset "vcat with view" begin
x = view(DataFrame(A=Vector{Union{Missing, Int}}(1:3)), 2:2, :)
y = DataFrame(A=4:5)
@test vcat(x, y) == DataFrame(A=[2, 4, 5]) ==
reduce(vcat, [x, y]) == reduce(vcat, (x, y))
end
@testset "reduce vcat corner cases" begin
df = DataFrame(a=1, b=2)
df1 = @view df[:, :]
df2 = @view df[:, 1:2]
@test typeof(df1) != typeof(df2)
@test_throws Union{MethodError, ArgumentError} reduce(vcat, ())
@test reduce(vcat, DataFrame[]) == DataFrame()
@test reduce(vcat, SubDataFrame[]) == DataFrame()
@test reduce(vcat, AbstractDataFrame[]) == DataFrame()
@test reduce(vcat, [df]) == df
@test reduce(vcat, [df1]) == df
@test reduce(vcat, [df2]) == df
@test reduce(vcat, [df, df]) == DataFrame(a=[1, 1], b=[2, 2])
@test reduce(vcat, [df, df1]) == DataFrame(a=[1, 1], b=[2, 2])
@test reduce(vcat, [df, df2]) == DataFrame(a=[1, 1], b=[2, 2])
@test reduce(vcat, [df1, df2]) == DataFrame(a=[1, 1], b=[2, 2])
@test reduce(vcat, (df,)) == df
@test reduce(vcat, (df1,)) == df
@test reduce(vcat, (df2,)) == df
@test reduce(vcat, (df, df)) == DataFrame(a=[1, 1], b=[2, 2])
@test reduce(vcat, (df, df1)) == DataFrame(a=[1, 1], b=[2, 2])
@test reduce(vcat, (df, df2)) == DataFrame(a=[1, 1], b=[2, 2])
@test reduce(vcat, (df1, df2)) == DataFrame(a=[1, 1], b=[2, 2])
end
end # module