Discussion about ApacheArrow

_Originally posted by @paddyhoran in https://github.com/rustsim/nalgebra/issues/473#issuecomment-439575367_

Hey, just wanted to leave a note here on this discussion. I have been contributing to [ApacheArrow](https://arrow.apache.org/), I added a tensor implementation but this was mostly following the C++ implementation.

The Rust implementation is relatively new but is growing steadily. I was hoping in time to reach out to projects like `nalgebra` and `ndarray` to discuss how we can have different projects interoperate with each other, I'm just not there yet. This is the whole aim behind Arrow, a common memory layout for different projects to build on. I believe that a robust Arrow implementation for Rust could be more important than for the other languages because the Rust community is small so fragmentation of the parties interested in scientific computing is a risk. However, if we were all building off a common base, or more likely provided ways to convert to and from a common base it could help the community grow.

Just wanted to get your thoughts on this let you know about Arrow.

Thanks