Moelf commented on issue #411:
URL: https://github.com/apache/arrow-julia/issues/411#issuecomment-1500670163
I did some digging
```diff
diff --git a/src/arraytypes/arraytypes.jl b/src/arraytypes/arraytypes.jl
index f3cee5d..a338004 100644
--- a/src/arraytypes/arraytypes.jl
+++ b/src/arraytypes/arraytypes.jl
@@ -34,7 +34,9 @@ Base.deleteat!(x::T, inds) where {T <: ArrowVector} =
throw(ArgumentError("`$T`
function toarrowvector(x, i=1, de=Dict{Int64, Any}(), ded=DictEncoding[],
meta=getmetadata(x); compression::Union{Nothing, Vector{LZ4FrameCompressor},
LZ4FrameCompressor, Vector{ZstdCompressor}, ZstdCompressor}=nothing, kw...)
@debugv 2 "converting top-level column to arrow format: col =
$(typeof(x)), compression = $compression, kw = $(values(kw))"
@debugv 3 x
+ @show typeof(x)
A = arrowvector(x, i, 0, 0, de, ded, meta; compression=compression,
kw...)
+ @show typeof(A)
if compression isa LZ4FrameCompressor
A = compress(Meta.CompressionTypes.LZ4_FRAME, compression, A)
elseif compression isa Vector{LZ4FrameCompressor}
```
```julia
julia> data = (; x = [[0x01, 0x02], UInt8[], [0x03]], y = [[0, 1], Int[],
[2,3]])
(x = Vector{UInt8}[[0x01, 0x02], [], [0x03]], y = [[0, 1], Int64[], [2, 3]])
julia> Arrow.write("/tmp/bug411.feather", data)
typeof(x) = Vector{Vector{UInt8}}
typeof(A) = Arrow.List{Vector{UInt8}, Int32, Arrow.ToList{UInt8, false,
Vector{UInt8}, Int32}}
typeof(x) = Vector{Vector{Int64}}
typeof(A) = Arrow.List{Vector{Int64}, Int32, Arrow.Primitive{Int64,
Arrow.ToList{Int64, false, Vector{Int64}, Int32}}}
"/tmp/bug411.feather"
```
the question is why `UInt8` is built `ToList` while `Int64` is Primitive
while both of them seem to be possible primitive
https://arrow.apache.org/docs/python/generated/pyarrow.uint8.html#pyarrow.uint8
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