a=Vector{Union{Missing, Int64}}() push!(a,1) push!(a,missing) push! to the union vector.Can this cause type instability?

No. Julia implements Union by storing a separate variable which tells which type the value has. The code then has branches, but no general type instability. You can check code stability yourself by using macro @code_warntype like @code_warntype f([1,2,3]).

Does union cause type instability？

General Usage

jd-foster December 3, 2022, 11:53am 2

Type stabilty is generally a property of functions, not collections.

Topic		Replies	Views
Is Union{Missing, Float64} a concrete type? Performance	3	666	August 5, 2021
For statement type instability General Usage question , bug , performance	10	485	September 12, 2024
Type container equivalence General Usage	9	520	April 19, 2023
Why is this case type-unstable? General Usage	6	850	February 15, 2020
Calling type-unstable functions within a type-stable function (and usage of Val) General Usage question	0	324	March 5, 2020

Does union cause type instability？

Related topics