We are trying to create a dataset with two main kinds of tabular data. They are both stored in CSV files, and have mostly the same fields, albeit with a few important differences. The Dataset library has trouble reading the dataset in any way. The files are neither concatenated into one with missing fields nulled, nor split into two separate entities in the object - both ways would be perfectly acceptable for our goals. Is there any configuration work we can do to prevent rebuilding large sets like this from scratch?