Function Aggregate

docs/app/js/sanddance-app.js:116083–116099

* Group-by aggregation operator. * @constructor * @param {object} params - The parameters for this operator. * @param {Array } [params.groupby] - An array of accessors to groupby. * @param {Array } [params.fields] - An array of accessors to aggregate. * @

(params)

 *   If true, the drop parameter is ignored and empty cells are retained.
 * @param {boolean} [params.drop=true] - A flag indicating if empty cells should be removed.
 */ function Aggregate(params) {
    (0, _vegaDataflow.Transform).call(this, null, params);
    this._adds = []; // array of added output tuples
    this._mods = []; // array of modified output tuples
    this._alen = 0; // number of active added tuples
    this._mlen = 0; // number of active modified tuples
    this._drop = true; // should empty aggregation cells be removed
    this._cross = false; // produce full cross-product of group-by values
    this._dims = []; // group-by dimension accessors
    this._dnames = []; // group-by dimension names
    this._measures = []; // collection of aggregation monoids
    this._countOnly = false; // flag indicating only count aggregation
    this._counts = null; // collection of count fields
    this._prev = null; // previous aggregation cells
    this._inputs = null; // array of dependent input tuple field names
    this._outputs = null; // array of output tuple field names
}
Aggregate.Definition = {
    "type": "Aggregate",
    "metadata": {