[fl0wenol]

I should point out that for many organizations that have "big data" sitting somewhere, it usually is structured to begin with because it was collected by a repeatable process; or at the very least each piece of the whole (if it is a collection of stuff from different corners) has its' own internal consistency.

A challenge there is determining whether it makes sense to massage the data into a common schema for further analysis or to use an unstructured initial approach from the beginning. Sometimes you get to the former from the latter.