assign method

Implementation

@override
void assign(TPersistent? source) {
  if (source is TIndexDef) {
    _name = source.name;
    fields = source.fields;
    options = {...source.options};
    _caseInsFields = source.caseInsFields;
    _descFields = source.descFields;
    this.source = source.source;
    _expression = source.expression;
    return;
  }
  super.assign(source);
}