bar3.vl

{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "data": {
        "url": "https://vega.github.io/vega-lite/data/population.json"
    },
    "description": "A bar chart showing the US population distribution of age groups in 2000.",
    "encoding": {
        "x": {
            "aggregate": "sum",
            "axis": {
                "title": "population"
            },
            "field": "people",
            "type": "quantitative"
        },
        "y": {
            "field": "age",
            "sort": "descending",
            "type": "ordinal"
        }
    },
    "height": {
        "step": 17
    },
    "mark": "bar",
    "transform": [
        {
            "filter": "datum.year == 2000"
        }
    ]
}