一、查询看 自己表的DATA_TYPE
select TENANT_ID,TABLE_SCHEM,TABLE_NAME,COLUMN_NAME,COLUMN_FAMILY,DATA_TYPE,TYPE_NAME,COLUMN_SIZE,DECIMAL_DIGITS
from system.catalog
where TABLE_NAME='表名'
2、修改为varchar类型
upsert into SYSTEM.CATALOG (TENANT_ID,TABLE_SCHEM,TABLE_NAME,COLUMN_NAME,COLUMN_FAMILY,DATA_TYPE)
values('','bigdata','student','age','msg',12)