Hands-On Design Patterns and Best Practices with Julia

Constructing a struct of arrays

It is easy and straightforward to construct a struct of arrays. After all, we were able to quickly do that for a single field earlier. For completeness, this is how we can design a new data type for storing the same trip payment data in a column-oriented format. The following code shows that this pattern helps to improve performance:

struct TripPaymentColumnarData    vendor_id::Vector{Int}    tpep_pickup_datetime::Vector{String}    tpep_dropoff_datetime::Vector{String}    passenger_count::Vector{Int}    trip_distance::Vector{Float64}    fare_amount::Vector{Float64}    extra::Vector{Float64}    mta_tax::Vector{Float64}    tip_amount::Vector{Float64}    tolls_amount::Vector{Float64}    improvement_surcharge::Vector{Float64} total_amount::Vector{Float64} ...