toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (aggregationFunction != null)
'aggregationFunction': aggregationFunction!,
if (alias != null) 'alias': alias!,
if (name != null) 'name': name!,
if (operator != null) 'operator': operator!,
if (value != null) 'value': value!,
};