Clarification on when order matters when reading multiple files with CSV.read?

New to Julia
5

Thanks for the replies! This has been incredibly helpful. longemen3000 posted the following with respect to the single row case (which I now understand is not caused by the single row) on github. Does this explain the described behavior?

found the error.

CSV.jl/src/utils.jl

Lines 234 to 242 in acd36a6
 elseif c isa Vector && b isa Vector 
     # two vectors, but we know eltype doesn't match, so try to promote 
     A = Vector{promote_types(eltype(c), eltype(b))} 
 elseif c isa SentinelVector && b isa SentinelVector 
     A = vectype(promote_types(Base.nonmissingtype(eltype(c)), Base.nonmissingtype(eltype(b)))) 
 end 
 x = ChainedVector([_promote(A, x) for x in a.arrays]) 
 y = _promote(A, b) 
 return append!(x, y)

there is a missing case where c isa PooledVector