GBase 8a增加列时报Column cannot be null或 doesn’t have a default value错误

GBase 8a增加列时报Column cannot be null或 doesn’t have a default value错误

GBase 8a支持alter增加新的列，当新增列指定了not null不许为null时，则必须指定default默认值，否则就会报Column cannot be null或 doesn’t have a default value错误