de / serialization of a CartesianIndex

[yakir12]

I expected to be able to round-trip the serialization of a CartesianIndex:

julia> df = DataFrame(a = 1, b = CartesianIndex(1,1))
1×2 DataFrame
 Row │ a      b                    
     │ Int64  Cartesia…            
─────┼─────────────────────────────
   1 │     1  CartesianIndex(1, 1)

julia> Arrow.write("table.arrow", df)
"table.arrow"

julia> df = DataFrame(Arrow.Table("table.arrow"))
1×2 DataFrame
 Row │ a      b             
     │ Int64  NamedTup…     
─────┼──────────────────────
   1 │     1  (I = (1, 1),)

[Moelf]

https://arrow.apache.org/julia/stable/manual/#Custom-types

you basically need to register the type and metadata yourself

[yakir12]

Wow, excellent documentation! Sorry I missed that. This resembles how JSON v1 works.

I guess one remaining slight oddity is that CartesianIndex is considered a custom type.