Can't aggregate nested field in bar chart.

[iliatimofeev]

Can't aggregate nested field in bar chart. Possible the same as #3727

{
  "mark": "bar",
  "encoding": {
    "y": { "field": "properties.variety", "type": "nominal"},
    "x": {
      "aggregate": "sum",
      "field": "properties.yield",
      "type": "quantitative"
    },
    "color": {"title": "site", "field": "properties.site", "type": "nominal"}
  },
  "data": {
    "values": {
      "features": [
        {
          "properties": {
            "variety": "Manchuria",
            "yield": 27,
            "site": "University Farm",
            "year": 1931
          }
        },
       {
          "properties": {
            "variety": "Wisconsin No. 38",
            "yield": 29.33333,
            "site": "Duluth",
            "year": 1932
          }
        }
      ],
      "type": "FeatureCollection"
    },
    "format": {"type": "json", "property": "features"}
  },
  "$schema": "https://vega.github.io/schema/vega-lite/v2.4.1.json"
}

live demo https://iliatimofeev.github.io/sharer/testreport/#horizontal_stacked_bar_chart

[iliatimofeev]

I thing it's another version

{
       "encoding": {
        "y": {
          "aggregate": "count",
          "stack": null,
          "type": "quantitative"
        },
        "x": {
          "bin":true,
          "title": "sepalLength",
          "field": "properties.sepalLength",
          "stack": null,
          "type": "quantitative"
        },
        "color": {
          "title": "species",
          "field": "properties.species",
          "type": "nominal"
        }
      },
      "data": {
        "values": {
          "features": [
            {
              "properties": {
                "sepalLength": 5.1,
                "species": "setosa"
              }
            },
            {
              "properties": {
                "sepalLength": 6.5,
                "species": "virginica"
              }
            },
            {
              "properties": {
                "sepalLength": 6.2,
                "species": "virginica"
              }
            },
            {
              "properties": {
                "sepalLength": 5.9,
                "species": "setosa"
              }
            }
          ],
          "type": "FeatureCollection"
        },
        "format": {"type": "json", "property": "features"}
      },

      "mark": "area",
    
  "$schema": "https://vega.github.io/schema/vega-lite/v2.4.1.json"
}

[domoritz]

Found the issue and fixed it in #4021.

[domoritz]

@iliatimofeev Thank you so much for the perfect examples to reproduce the issue! This made it so much easier for me to fix this.