Add row duplication during transformation

[MNic]

This would be nice functionality to fix our classic Blood Pressure issue. We'd like to be able to use transformers to split the value of a row and create a row copy in all other positions.

There are some real complexities with this though regarding order of transformations and any additional transformations that occur on the mostly duplicated row. I could imagine a scenario where we prioritize these 'duplication' type transformers first then run any other transformers on the resulting row set. We'd be limited to doing this once per row unless we bake in row de-duplication.

I haven't started working on this one yet, but would definitely dig into it if it's something that could be added cleanly.

Example

Input

patient	vital	value
A	BP	120/80

Output

patient	vital	value
A	SBP	120
A	DBP	80