Method assembleGroup

resources/vega-lite.min.js:13002–13019

(e)

    }
    assembleGroupStyle() {}
    assembleGroup(e) {
      return this.parent && this.parent instanceof pp
        ? {
            ...(this.channelHasField("column")
              ? {
                  encode: {
                    update: {
                      columns: {
                        field: ma(this.facet.column, { prefix: "distinct" }),
                      },
                    },
                  },
                }
              : {}),
            ...super.assembleGroup(e),
          }
        : super.assembleGroup(e);
    }
    getCardinalityAggregateForChild() {
      const e = [],
        t = [],