Poncito opened a new issue #281:
URL: https://github.com/apache/arrow-julia/issues/281
Hello,
I have a custom type defined this way:
```julia
struct Char8 <: AbstractChar
x::UInt8
end
Char8(x::Integer) = Char8(UInt8(x))
Char8(x::AbstractChar) = Char8(UInt8(x))
Base.codepoint(c::Char8) = UInt32(c.x)
Base.isvalid(::Type{Char8}, x::UInt8) = true
Base.isvalid(::Type{Char8}, x::Integer) = isvalid(UInt8, x)
Base.isvalid(::Type{Char8}, x::AbstractChar) = isvalid(UInt8, x)
```
and serialized this way
```julia
ArrowTypes.ArrowKind(::Type{Char8}) = ArrowTypes.PrimitiveKind()
ArrowTypes.ArrowType(::Type{Char8}) = UInt8
const CHAR8 = Symbol("JuliaLang.Char8")
ArrowTypes.arrowname(::Type{Char8}) = CHAR8
ArrowTypes.toarrow(x::Char8) = x.x
ArrowTypes.fromarrow(::Type{Char8}, x::UInt8) = Char8(x)
ArrowTypes.JuliaType(::Val{CHAR8}) = Char8
```
The following throws:
```julia
a=[(Char8(1),Char8(2))]
table = (col1=a,)
io = IOBuffer()
Arrow.write(io, table;compress=:zstd)
```
but only when the compression is enabled. Is that expected?
I also noticed that the ArrowType seems wrong, because it calls the identity
function.
So, why not setting the following default,
```ArrowTypes.ArrowType(::Type{NTuple{N, T}}) where {N, T} = NTuple{N,
ArrowTypes.ArrowType(T)}``` ?
This line solves this issue in my case.
Thanks,
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