This is why the first, possibly most important phase of a data analytics job is to filter down to the subset of the data that you actually need to compute the r

This is why the first, possibly most important phase of a data analytics job is to filter down to the subset of the data that you actually need to compute the result. Collecting it all on the front end can be very effective, as long as you can easily filter. If you can't, you are just causing yourself more problems.