WingsGo commented on pull request #4009:
URL: https://github.com/apache/incubator-doris/pull/4009#issuecomment-653709707
I have tested by following:
```
CREATE TABLE `test_schema_change` (
`k1` int NULL,
`v1` varchar NULL
) ENGINE=OLAP
DUPLICATE KEY(`k1`)
DISTRIBUTED BY HASH(`k1`) BUCKETS 1
PROPERTIES (
"replication_num" = "1"
);
alter table test_schema_change modify column v1 tinyint;
alter table test_schema_change modify column v1 varchar;
alter table test_schema_change modify column v1 smallint;
alter table test_schema_change modify column v1 varchar;
alter table test_schema_change modify column v1 int;
alter table test_schema_change modify column v1 varchar;
alter table test_schema_change modify column v1 bigint;
alter table test_schema_change modify column v1 varchar;
alter table test_schema_change modify column v1 largeint;
alter table test_schema_change modify column v1 varchar;
alter table test_schema_change modify column v1 float;
alter table test_schema_change modify column v1 varchar;
alter table test_schema_change modify column v1 double;
alter table test_schema_change modify column v1 varchar;
alter table test_schema_change modify column v1 date;
```
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