Concat spec raises error: Source nodes are roots and cannot be removed.

[domoritz]

Source nodes are roots and cannot be removed.

Open the Chart in the Vega Editor

[intiocean]

I think this is happening to me - I've recently updated from 4.14.1 in production and now getting errors in the js console and charts aren't rendering. Going to roll back to 4.14.1 until this is released.

FYI I've tested with 4.15.0 and 4.16.1 and both have the same issue so assume this bug was introduced in 4.15.0

[domoritz]

Did you test against master? Can you share your spec so we can try it?

[domoritz]

I just made a release. Please try again.

[intiocean]

Hi - here's a spec generated using Altair that wasn't working - haven't yet had a chance to try it on the latest release but will let you know when I have.

{
  "$schema": "https://vega.github.io/schema/vega-lite/v4.8.1.json",
  "config": {
    "axis": {
      "labelFontSize": 12,
      "titleFontSize": 12
    },
    "legend": {
      "title": null
    },
    "view": {
      "continuousHeight": 300,
      "continuousWidth": 400
    }
  },
  "datasets": {
    "data-5f0f5ff84876a23e79b92d513f6417a5": [
      {
        "days": "1970-10-04T00:00:00",
        "y": -1
      },
      {
        "days": "1970-10-05T00:00:00",
        "y": -1
      },
      {
        "days": "1970-10-06T00:00:00",
        "y": -1
      },
      {
        "days": "1970-10-07T00:00:00",
        "y": -1
      },
      {
        "days": "1970-10-08T00:00:00",
        "y": -1
      },
      {
        "days": "1970-10-09T00:00:00",
        "y": -1
      },
      {
        "days": "1970-10-10T00:00:00",
        "y": -1
      },
      {
        "days": "1970-10-11T00:00:00",
        "y": -1
      }
    ],
    "data-9f2c8635c2b2a676ea596b4b4cb25013": [
      {
        "activity": "Treatment: C",
        "day": "2020-10-04T00:00:00+01:00",
        "day_sameyear": "1970-10-04T00:00:00",
        "notes": "xxx",
        "season": "2020-2021",
        "sector": "123 abc",
        "thing_id": 45195
      },
      {
        "activity": "Treatment: S",
        "day": "2020-10-11T00:00:00+01:00",
        "day_sameyear": "1970-10-11T00:00:00",
        "notes": "xxx",
        "season": "2020-2021",
        "sector": "123 abc",
        "thing_id": 45195
      }
    ]
  },
  "height": 90,
  "layer": [
    {
      "data": {
        "name": "data-5f0f5ff84876a23e79b92d513f6417a5"
      },
      "encoding": {
        "opacity": {
          "value": 0
        },
        "x": {
          "field": "days",
          "type": "temporal"
        }
      },
      "mark": "point",
      "selection": {
        "selector041": {
          "empty": "none",
          "fields": [
            "days"
          ],
          "nearest": true,
          "on": "mouseover",
          "type": "single"
        }
      }
    },
    {
      "data": {
        "name": "data-5f0f5ff84876a23e79b92d513f6417a5"
      },
      "encoding": {
        "x": {
          "field": "days",
          "type": "temporal"
        }
      },
      "mark": {
        "color": "gray",
        "type": "rule"
      },
      "transform": [
        {
          "filter": {
            "selection": "selector041"
          }
        }
      ]
    },
    {
      "data": {
        "name": "data-5f0f5ff84876a23e79b92d513f6417a5"
      },
      "encoding": {
        "text": {
          "field": "days",
          "timeUnit": "monthdate",
          "type": "temporal"
        },
        "x": {
          "field": "days",
          "type": "temporal"
        },
        "y": {
          "axis": null,
          "field": "y",
          "type": "quantitative"
        }
      },
      "mark": {
        "align": "left",
        "color": "gray",
        "dx": 5,
        "dy": -10,
        "fontWeight": 600,
        "type": "text"
      },
      "transform": [
        {
          "filter": {
            "selection": "selector041"
          }
        }
      ]
    },
    {
      "data": {
        "name": "data-9f2c8635c2b2a676ea596b4b4cb25013"
      },
      "encoding": {
        "color": {
          "field": "activity",
          "scale": {
            "domain": [
              "Treatment: Compost",
              "Treatment: Spray Round"
            ],
            "range": [
              "rgba(105,105,191,0.8)",
              "rgba(102,187,106,0.8)",
              "rgba(255,167,38,0.8)",
              "rgba(139,61,119,0.8)",
              "rgba(56,147,255,0.8)",
              "rgba(144,88,211,0.8)",
              "rgba(86,139,75,0.8)",
              "rgba(178,122,21,0.8)",
              "rgba(3,84,178,0.8)",
              "rgba(216,138,196,0.8)",
              "rgba(30,7,58,0.8)",
              "rgba(172,159,132,0.8)",
              "rgba(211,160,88,0.8)",
              "rgba(227,26,28,0.8)",
              "rgba(251,154,153,0.8)",
              "rgba(166,206,227,0.8)",
              "rgba(255,127,0,0.8)"
            ]
          },
          "type": "nominal"
        },
        "tooltip": [
          {
            "field": "sector",
            "title": "Block",
            "type": "nominal"
          },
          {
            "field": "day",
            "title": "Date",
            "type": "temporal"
          },
          {
            "field": "activity",
            "title": "Activity",
            "type": "nominal"
          }
        ],
        "x": {
          "axis": {
            "grid": false,
            "title": ""
          },
          "field": "day_sameyear",
          "scale": {
            "padding": 10
          },
          "type": "temporal"
        },
        "y": {
          "axis": {
            "grid": true
          },
          "field": "season",
          "sort": {
            "field": "day",
            "order": "descending"
          },
          "type": "nominal"
        }
      },
      "mark": {
        "opacity": 1,
        "size": 100,
        "type": "circle"
      },
      "selection": {
        "selector040": {
          "type": "single"
        }
      }
    }
  ],
  "title": "",
  "width": "container"
}