Maybe some context can help. Now, I have a ~100GB compressed ROOT archive which contains a lot of observation (event in root terms) and 50 variables (branch in root terms) per observation from an physics experiment. And from experience and rough math, I'm expecting a 1TB JSON or a 400GB CSV file if I de-compress my root archive. And my college, the statistician's job is to go through these few hundred million observations and find the outliers, then append statistics to each observation so I can find malfunctions in the equipments. So, here's the problem. As he primarily uses SAS, he needs a way to import all my data in ROOT into SAS. But JSON is obviously nonviable and CSV doesn't scale (I need to generate the CSV then compress it). The opposite problem of sending data from SAS to ROOT is also a big one.
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