I am trying to understand the internals of the datatype Union{Missing, Float64}. From what I understand, this type encodes the presence of elements in the array by means of a hidden Array{UInt8}, which flags which elements are present and which are not. I tried to determine if this was true using s…

cf [image] sizeof(::Vector{Union{missing,T}}), and hypothetical size General Usage Two (related) questions: julia> sizeof(vcat(ones(10), fill(missing, 10))) 160 but I expected 20*9 because of the type tag, what am I missing? v"1.1.0-DEV.298". If I have a type T wh…

Question about internal representation of Union{Missing, Float64}

General Usage Performance

Tamas_Papp October 31, 2018, 11:07am 2

Topic		Replies	Views
sizeof(::Vector{Union{missing,T}}), and hypothetical size General Usage question	12	1154	March 14, 2021
How to tell if a type is an efficient small type union? General Usage	11	1132	December 20, 2018
Fastest way to count unique elements in `Vector{Union{Bool, Missing})` Performance	35	6994	January 16, 2018
Memory allocation of user defined type General Usage	5	801	May 9, 2018
Mmap(io, Vector{Union{Missing,T}}, ...) General Usage question	1	466	March 3, 2018

Question about internal representation of Union{Missing, Float64}

Related topics