Moelf commented on issue #340: URL: https://github.com/apache/arrow-julia/issues/340#issuecomment-1270485419
this is the whole thing we do un UnROOT.jl for a physics-community only thing called `TTree`, their next-gen storage called `RNTuple` is basically `Feather`: https://indico.cern.ch/event/1208767/contributions/5083082/attachments/2523220/4340111/PPP_uproot_RNTuple.pdf#page=13 while we will get there eventually, in `UnROOT` I have the whole machinery basically: - `getindex` -> find the row group -> - if not in cache, decompress and put in cache - if in cache, directly try to locate the slot this way, at most one row group worth of data ever lives in RAM, in fact that's the minimal amount you need in RAM, because you can only know row number start-end for an entire row group and you have to count inside it. but yeah, this is a whole thing in UnROOT.jl and it's mission-critical because our data are like, O(100) GB compressed all the time -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
