I wanted to highlight just one column in a bar chart with Vega
It took me some time and some digging through different examples to find a reasonable hack to get where I wanted.
It is not perfect yet but it works. And if you have a different way let me know. Would love to improve it.
Here is the code I use:
I add a new field called highlight and set it to true for one variable. And use the new field to select the color.
Here is the result: