Hey all, I'd like to add a human readable element type string for pcollections as a piece of display data. Currently, if any kind of dashboard wants to display what type of elements are in a pcollection, the best it can do with the pipeline proto afaict is to try to infer it from the associated coder, which may not always have very specific information. For example, any user-defined python class is just encoded with the pickle coder whose type hint is just `Any`.
Does anyone have any thoughts on this? This could be done with a new standard displaydata type and then every SDK could optionally add it during pipeline construction/serialization time. If we're not sure of its usefulness, we could limit it to the python SDK to trial it. Best, Joey
