Definition of number successful run

[gordonwatts]

If any of the files are marked as failed then the whole run is marked as failed and should not be in the cache.

List of files in cli should always show completed files not the full list from dataset

[alexander-held]

For partial results in particular it would be important to propagate the metadata corresponding to the initial number of events in the files that were processed succesfully to allow for correct normalization of the results.

[ponyisi]

So we don't actually have a simple way at the moment of propagating any file metadata like the number of input rows, although this is something that we know (sometimes, depends on the transformation).

A step towards this is #516.