Someone kindly gave an answer on GitHub - the first argument needs to be the labels of the groups:
@df df boxplot(string.(tuple.(:a, :b)), :dat, group=(:a, :b))
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Someone kindly gave an answer on GitHub - the first argument needs to be the labels of the groups:
@df df boxplot(string.(tuple.(:a, :b)), :dat, group=(:a, :b))