src/chart/treemap/TreemapSeries.js
function (dataIndex) {
        var params = SeriesModel.prototype.getDataParams.apply(this, arguments);

        var node = this.getData().tree.getNodeByDataIndex(dataIndex);
        params.treePathInfo = wrapTreePathInfo(node, this);

        return params;
    }
function (dataIndex) {
        var params = SeriesModel.prototype.getDataParams.apply(this, arguments);

        var node = this.getData().tree.getNodeByDataIndex(dataIndex);
        params.treePathInfo = wrapTreePathInfo(node, this);

        return params;
    }
function ( dataIndex ) { var params = SeriesModel . prototype . getDataParams . apply ( this , arguments ) ; var node = this . getData ( ) . tree . getNodeByDataIndex ( dataIndex ) ; params . treePathInfo = wrapTreePathInfo ( node , this ) ; return params ; }
Add tree path to tooltip param

@override
@param {number} dataIndex
@return {Object}
Add tree path to tooltip param