function build()

in src/table.jl [747:780]

• 33 lines of code
• 6 McCabe index (conditional complexity)

function build(f::Meta.Field, L::ListTypes, batch, rb, de, nodeidx, bufferidx, convert)
    @debugv 2 "building array: L = $L"
    validity = buildbitmap(batch, rb, nodeidx, bufferidx)
    bufferidx += 1
    buffer = rb.buffers[bufferidx]
    ooff = batch.pos + buffer.offset
    OT = L isa LargeLists ? Int64 : Int32
    bytes, offs = reinterp(OT, batch, buffer, rb.compression)
    offsets = Offsets(bytes, offs)
    bufferidx += 1
    len = rb.nodes[nodeidx].length
    nodeidx += 1
    meta = buildmetadata(f.custom_metadata)
    T = juliaeltype(f, meta, convert)
    if L isa Meta.Utf8 ||
       L isa Meta.LargeUtf8 ||
       L isa Meta.Binary ||
       L isa Meta.LargeBinary
        buffer = rb.buffers[bufferidx]
        bytes, A = reinterp(UInt8, batch, buffer, rb.compression)
        bufferidx += 1
    else
        bytes = UInt8[]
        A, nodeidx, bufferidx =
            build(f.children[1], batch, rb, de, nodeidx, bufferidx, convert)
        
        S = Base.nonmissingtype(T)
        if S <: Vector
            ST = SubVector{eltype(A),typeof(A)}
            T = S == T ? ST : Union{Missing,ST}
        end
    end
    return List{T,OT,typeof(A)}(bytes, validity, offsets, A, len, meta), nodeidx, bufferidx
end