Function Key

docs/tests/v2/es6/js/sanddance.js:91099–91101

* Generates a key function. * @constructor * @param {object} params - The parameters for this operator. * @param {Array } params.fields - The field name(s) for the key function. * @param {boolean} params.flat - A boolean flag indicating if the field names * should be treated as flat pro

(params)

 *  lookups normally indicated by dot or bracket notation.
 */
function Key(params) {
  _vegaDataflow.Operator.call(this, null, update, params);
}

(0, _vegaUtil.inherits)(Key, _vegaDataflow.Operator);