toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (column != null) 'column': column!,
if (description != null) 'description': description!,
if (mode != null) 'mode': mode!,
if (subcolumns != null) 'subcolumns': subcolumns!,
if (type != null) 'type': type!,
};