Does Vega-Lite support self-linking only?
earowang opened this issue · 3 comments
Haven't seen any examples that link between different datasets with common keys.
You can in principle have a data key for each layer of a spec but you have to do manual lookups as transforms to get them to link, i.e by row_number or a key in the data. You can also specify many datasets in the top part of the spec (above any layers) and then do look ups within a layer.
A big sell for virgo would be able to get that working in a cleaner way and have more options for joining. Not sure how we would do that without getting into the JS side of things a bit. cc @ijlyttle for any thoughts.
I currently use inline data values work fine unless named data source has performant run time.data$values to pass data, but o make spec simpler and easier for the future, I should switch to use datasets.
Just add a lookup example to join multiple datasets here https://vega.github.io/vega-lite/examples/lookup.html