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How disk.frame works

Many of disk.frame's functions, such as map.disk.frame and delayed are just convenience functions to let you perform the same operation to each chunk. The convenience comes from the fact that it loads every chunk into a data.table/data.frame and does the saving to disk automatically into .fst files.

TODO: convenience disk.frame syntax proposal

disk.frame_code({
  libname(a, path1)
  libname(b, path2)

  a~disk.frame2 = delayed(b~disk.frame1, some_fn)
})