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If you were to do this in SAS to create an empty SAS dataset: data mytable; run; It would actually create a dataset with one row. The data step cycles through once, hits the end (run), outputs a row, then comes back and finds it has no more rows to process so it stops. To [...]

Everyone in the computer science field (should) eventually learn or realize that any recursive function can be rewritten as an iterative process with the aid of a stack. Since a SAS Data Step is iterative, it’s fairly easy to look up children of a tree node in metadata, but nearly impossible to recursively look up [...]