Daft Sparse Tensor Logical Type

[samster25]

• Enable an in memory format for sparse tensors like COO
• This should also work with writing out to parquet. We can probably export to something like arrows sparse tensor type:

https://arrow.apache.org/docs/cpp/api/tensor.html#sparse-tensors

[michaelvay]

Hi, I am on it :)

[jaychia]

@michaelvay let us know how progress is so far! Happy also to pair up and walk you through any parts of the codebase that you might have questions on.