Select columns from StructArray

General Usage
1

How can I choose columns from a StructArray?

julia> StructArray(a=[1,2], b=[10,20], c=[100, 200])[(:a,:b)]
ERROR: ArgumentError: invalid index: (:a, :b) of type Tuple{Symbol, Symbol}
2

You can get a single column with A.a, A.b. For multiple columns I don’t know if there’s something better than [getproperty(A, c) for c in (:a, :b)] or getproperty.(Ref(A), (:a, :b))

3

Ah actually there’s components:

julia> A = StructArray(a=[1,2], b=[10,20], c=[100, 200])
2-element StructArray(::Vector{Int64}, ::Vector{Int64}, ::Vector{Int64}) with eltype @NamedTuple{a::Int64, b::Int64, c::Int64}:
 (a = 1, b = 10, c = 100)
 (a = 2, b = 20, c = 200)

julia> StructArrays.components(A)[(:a, :b)]
(a = [1, 2], b = [10, 20])

But it’s deprecated…