field as a scale range is not added to group by of aggregation

[aplavin]

Docs (https://vega.github.io/vega-lite/docs/scale.html#range) say that color values can be taken directly from data:

For discrete and discretizing scales, an array of desired output values or an object with a field property representing the range values. For example, if a field color contains CSS color names, we can set range to {field: "color"}.

When I try this, nothing is shown in the plot: example. Data viewer suggests that the color field doesn't make it into the resulting dataset.

If I bind this field (color) to another property, everything suddenly works fine! Example.

As I undestand, both examples linked above are supposed to give the same result.

[domoritz]

Yes, looks like we don't add the color field to the group by of the aggregation. Open the Chart in the Vega Editor.

[aplavin]

Thanks for clarification, indeed it does work without aggregates.