AbstractRange can be aliased

Author: gustafsson

src/dataframe/dataframe.jl

@@ -232,7 +232,7 @@ end
 
 function _preprocess_column(col::Any, len::Integer, copycols::Bool)
     if col isa AbstractRange
-        return collect(col)
+        return copycols ? collect(col) : col
     elseif col isa AbstractVector
         return copycols ? copy(col) : col
     elseif col isa Union{AbstractArray{<:Any, 0}, Ref}

test/alias.jl

@@ -8,6 +8,7 @@ const ≅ = isequal
         dfr = DataFrame(init, :auto)
         @testset "$v" for v in [
                 [1,2,3],
+                1:3,
                 ]
             @testset "df.x2 = v" begin
                 df = copy(dfr)

test/grouping.jl

@@ -4171,7 +4171,7 @@ end
     # eachindex on DataFrame
     @test combine(df, eachindex) == DataFrame(eachindex=1:6)
     @test isequal_coltyped(combine(DataFrame(), eachindex),
-                           DataFrame(eachindex=Int[]))
+                           DataFrame(eachindex=Base.OneTo(0), copycols = false))
 
     # Disallowed operations
     @test_throws ArgumentError groupindices(df)
@@ -4248,14 +4248,16 @@ end
           DataFrame(x = df.x, id = df.id, eachindex = 1:6)
     df = view(df, [], :)
     df2 = combine(df, eachindex)
-    @test isequal_coltyped(df2, DataFrame(eachindex = Int[]))
+    @test isequal_coltyped(df2, DataFrame(eachindex = Base.OneTo(0), copycols = false))
     @test isequal_coltyped(df2, combine(eachindex, df))
-    @test isequal_coltyped(df2, rename(combine(df, eachindex => :a), :a => :eachindex))
+    @test isequal_coltyped(df2, rename!(combine(df, eachindex => :a), :a => :eachindex))
+    @test isequal_coltyped(copy(df2), rename(combine(df, eachindex => :a), :a => :eachindex))
 
     df2 = transform(df, eachindex)
-    @test isequal_coltyped(df2, DataFrame(x = Int[], id = Int[], eachindex = Int[]))
+    @test isequal_coltyped(df2, DataFrame(x = Int[], id = Int[], eachindex = Base.OneTo(0), copycols = false))
     @test isequal_coltyped(df2, transform(eachindex, df))
-    @test isequal_coltyped(df2, rename(transform(df, eachindex => :a), :a => :eachindex))
+    @test isequal_coltyped(df2, rename!(transform(df, eachindex => :a), :a => :eachindex))
+    @test isequal_coltyped(copy(df2), rename(transform(df, eachindex => :a), :a => :eachindex))
 end
 
 @testset "fillfirst! correctness tests" begin

test/iteration.jl

@@ -73,7 +73,7 @@ end
     df = DataFrame(a=1)
     df = mapcols(x -> 2:2, df)
     @test df == DataFrame(a=2)
-    @test df.a isa Vector{Int}
+    @test df.a isa AbstractRange{Int}
 end
 
 @testset "mapcols!" begin