hww123 opened a new issue #3634:
URL: https://github.com/apache/incubator-doris/issues/3634
doris version:12.8
**case**:
```
CREATE TABLE `test1` (
`field1` varchar(500) NULL COMMENT "",
`field2` int(11) NULL COMMENT "0",
`field3` bigint(20) NULL COMMENT "0"
) ENGINE=OLAP
UNIQUE KEY(`field1`, `field2`)
DISTRIBUTED BY HASH (field1) BUCKETS 10
PROPERTIES (
"replication_num" = "3",
"storage_format" = "DEFAULT"
);
```
Alter Table Sql
```
1.ALTER TABLE test.test1 ADD COLUMN field4 varchar(100) default '';
2.ALTER TABLE test.test1 MODIFY COLUMN field4 bigint(20);
```
when execute second alter sql throw this error
**_Error : errCode = 2, detailMessage = Can not change default value_**
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