Plot based on lens on column (e.g. tuple-valued column)

[goretkin]

Instead of

df.hallway_width2 = map(x->x[2], df[!, :hallway_widths])

df |> @vlplot(
    mark={:boxplot, extent="min-max"},
    x = {:hallway_width2},
    y = {:tree_size, axis={title="tree size"}}
)

Is it possible to do something like

df |> @vlplot(
    mark={:boxplot, extent="min-max"},
    x = {:hallway_width, accessor=x->x[2]},
    y = {:tree_size, axis={title="tree size"}}
)

?

[davidanthoff]

Is the idea here that the column hallway_widths is of type Pair or Tuple or something like that, and you want to extract the second element?

I would do this with Query.jl:

df |>
@mutate(hallway_width2 = _.hallway_widths[2]) |>
@vlplot(...)