observablehq / observablehq/plot
Generating extra channels with the group transform?
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enhancement
question
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- HTML
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Description
Should it be possible to use the channels option with the group transform (and bin transform)? That way you could generate and group an extra channel that is unknown to the mark. I think currently the channels option simply gets propagated, so you can’t reference an extra channel as a group output.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the group and bin transforms and how they handle the channels option. Determine the expected behavior for an extra channel unknown to the mark, then add coverage showing that it can be generated, grouped, and exposed as a group output.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- d3
- Domain
- data-visualization
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100