toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (filters != null) 'filters': filters!,
if (groupBys != null) 'groupBys': groupBys!,
if (metrics != null) 'metrics': metrics!,
if (options != null) 'options': options!,
if (type != null) 'type': type!,
};