Map/Reduce Aggregation

[michaelwisely]

Some kind of map/reduce feature for Grader, so that we can aggregate information about submissions

map func for each submission
reduce gets a list of results from mappers

Could be useful for computing submission similarities or aggregating results.

Had to make an issue before I lost this piece of paper here.

[brhoades]

Could one of you draft up an example of how you'd expect this to flow? For example, is mapping a submission-level command or an assignment-level command?

[michaelwisely]

@brhoades I can do that.

Also, the *-level concern is important for a handful of different grader commands. We really need to iron out how we want to deal with re-submits and re-grades. It gets really hairy really quick.