Ask HN: Parsing arbitrarily structured data by example

I remember seeing a demo here last year of a system which allowed you to enter arbitrarily structured data (be it JSON, CSV or some custom format), and by selecting a few examples of the data, the demo was then able to parse the entire dataset.

For example, if you provided data in this format which I've just made up:

"Pig";"Dog";"Mouse";"Cat"

By selecting Pig, it was able to determine the formatting, and returns Dog, Mouse and Cat as well.

However, I've been unable to find this demo, or any example of something similar. Can anyone point me in the right direction?