{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "white",
  "padding": 5,
  "width": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "values": [
        {"key": "alpha", "foo": [1, 2], "bar": ["A", "B"]},
        {"key": "beta", "foo": [3, 4, 5], "bar": ["C", "D"]}
      ]
    },
    {
      "name": "data_0",
      "source": "source_0",
      "transform": [
        {"type": "flatten", "fields": ["foo", "bar"], "as": ["foo", "bar"]},
        {
          "type": "filter",
          "expr": "isValid(datum[\"foo\"]) && isFinite(+datum[\"foo\"])"
        }
      ]
    }
  ],
  "signals": [
    {"name": "y_step", "value": 20},
    {
      "name": "height",
      "update": "bandspace(domain('y').length, 1, 0.5) * y_step"
    }
  ],
  "marks": [
    {
      "name": "marks",
      "type": "symbol",
      "style": ["circle"],
      "from": {"data": "data_0"},
      "encode": {
        "update": {
          "opacity": {"value": 0.7},
          "fill": {"scale": "color", "field": "key"},
          "ariaRoleDescription": {"value": "circle"},
          "description": {
            "signal": "\"foo: \" + (format(datum[\"foo\"], \"\")) + \"; bar: \" + (isValid(datum[\"bar\"]) ? datum[\"bar\"] : \"\"+datum[\"bar\"]) + \"; key: \" + (isValid(datum[\"key\"]) ? datum[\"key\"] : \"\"+datum[\"key\"])"
          },
          "x": {"scale": "x", "field": "foo"},
          "y": {"scale": "y", "field": "bar"},
          "shape": {"value": "circle"}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "linear",
      "domain": {"data": "data_0", "field": "foo"},
      "range": [0, {"signal": "width"}],
      "nice": true,
      "zero": true
    },
    {
      "name": "y",
      "type": "point",
      "domain": {"data": "data_0", "field": "bar", "sort": true},
      "range": {"step": {"signal": "y_step"}},
      "padding": 0.5
    },
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "data_0", "field": "key", "sort": true},
      "range": "category"
    }
  ],
  "axes": [
    {
      "scale": "x",
      "orient": "bottom",
      "gridScale": "y",
      "grid": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "x",
      "orient": "bottom",
      "grid": false,
      "title": "foo",
      "labelFlush": true,
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "zindex": 0
    },
    {"scale": "y", "orient": "left", "grid": false, "title": "bar", "zindex": 0}
  ],
  "legends": [
    {
      "fill": "color",
      "symbolType": "circle",
      "title": "key",
      "encode": {"symbols": {"update": {"opacity": {"value": 0.7}}}}
    }
  ]
}