Log-scaled Histogram

Log-scaled Histogram. We may improve the support of this. See https://github.com/vega/vega-lite/issues/4792.

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Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "description": "Log-scaled Histogram.  We may improve the support of this. See https://github.com/vega/vega-lite/issues/4792.",
  "data": {
    "values": [
      {"x": 0.01},
      {"x": 0.1},
      {"x": 1},
      {"x": 1},
      {"x": 1},
      {"x": 1},
      {"x": 10},
      {"x": 10},
      {"x": 100},
      {"x": 500},
      {"x": 800}
    ]
  },
  "transform": [{
      "calculate": "log(datum.x)/log(10)", "as": "log_x"
  }, {
      "bin": true,
      "field": "log_x",
      "as": "bin_log_x"
  }, {
    "calculate": "pow(10, datum.bin_log_x)", "as": "x1"
  }, {
    "calculate": "pow(10, datum.bin_log_x_end)", "as": "x2"
  }],
  "mark": "bar",
  "encoding": {
    "x": {
      "field": "x1",
      "type": "quantitative",
      "scale": {"type": "log", "base": 10},
      "axis": {"tickCount": 5}
    },
    "x2": {
      "field": "x2"
    },
    "y": {
      "aggregate": "count",
      "type": "quantitative"
    }
  }
}