Vega transform dynamic groupby aggregate

Elastic Stack Kibana
1

Is It possible to keep the groupby field list dynamic in transform type “aggregate” and allow the user to pass one or more fields to groupby operation during usage time ?

2

Hi
I solved similar problem with creating multiple data sources with type as formula column, then filter it based on signal input:

signals: [
    {
      name: Zobrazení
      value: Celkově
      bind: {
        input: radio
        options: ["Celkově", "Po zaměstnancích"]
      }
]
...
 {
  name: table_zam
  source: ["funkce_zam"]
  transform: [...
    {type: "formula", expr: "('Po zaměstnancích')", as: "tab"}
  ]
}
{
  name: table_all
  source: ["funkce_all"]
  transform: [...
  {type: "formula", expr: "('Celkově')", as: "tab"}
  ]
}
 {
      name: table
      source: ["table_all", "table_zam"]
      transform: [
        {type: "filter", expr: "datum.tab === Zobrazení"}
      ]
    }

Misa