Frames - http://acowley.github.io/Frames/ - is built on top of vinyl and provides one way to access data either as an array of structures or a structures of arrays.

Thanks Doug, Nice ability to define column types on the fly, and interpret them from incoming CSV. Yes and treat as structure of arrays. AFAICT Frames keeps each set of records distinct; and wants each set to be same type/same columns and types. So there's no heterogeneous repository.

whether it allows the kind of filtering you were asking for.

There's standard filtering features you'd get with Set or List. I'm not seeing any ability to match/join across different datasets. That is, you'd have to write your own code. AntC