baumgold commented on issue #499:
URL: https://github.com/apache/arrow-julia/issues/499#issuecomment-1928165243
A concrete performance issue:
```julia
julia> buf =
Arrow.tobuffer([(x=1,y="foo",z=[1]),(x=2,y="bar",z=[2,3]),(x=3,y="baz",z=[4,5,6])]);
julia> tt = Arrow.Table(buf)
Arrow.Table with 3 rows, 3 columns, and schema:
:x … Int64
:y String
:z SubArray{Int64, 1, Arrow.Primitive{Int64, Vector{Int64}},
Tuple{UnitRange{Int64}}, true}
julia> @code_warntype iterate(first(Tables.rows(tt)))
MethodInstance for
iterate(::Tables.ColumnsRow{Tables.CopiedColumns{Arrow.Table}})
from iterate(r::Union{Tables.AbstractColumns, Tables.AbstractRow}) @
Tables ~/.julia/packages/Tables/NSGZI/src/Tables.jl:195
Arguments
#self#::Core.Const(iterate)
r::Tables.ColumnsRow{Tables.CopiedColumns{Arrow.Table}}
Body::Union{Nothing, Tuple{Any, Int64}}
1 ─ %1 = (#self#)(r, 1)::Union{Nothing, Tuple{Any, Int64}}
└── return %1
```
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