Problem: IColumn::is_date property will lost after ColumnDate::clone called. Fix: After ColumnDate created, also set IColumn::is_date. Co-authored-by: cambyzju <zhuxiaoli01@baidu.com>
Problem: IColumn::is_date property will lost after ColumnDate::clone called. Fix: After ColumnDate created, also set IColumn::is_date. Co-authored-by: cambyzju <zhuxiaoli01@baidu.com>