Function Stratify

docs/app/js/sanddance-app.js:137095–137097

* Stratify a collection of tuples into a tree structure based on * id and parent id fields. * @constructor * @param {object} params - The parameters for this operator. * @param {function(object): *} params.key - Unique key field for each tuple. * @param {function(object): *} params.parentKey -

(params)

 * @param {function(object): *} params.key - Unique key field for each tuple.
 * @param {function(object): *} params.parentKey - Field with key for parent tuple.
 */ function Stratify(params) {
    (0, _vegaDataflow.Transform).call(this, null, params);
}
Stratify.Definition = {
    "type": "Stratify",
    "metadata": {