wyndia opened a new issue #4753:
URL: https://github.com/apache/incubator-doris/issues/4753
**Describe the bug**
Version: Apache Doris 0.12.0-rc03
Using `ALTER TABLE` to add a partiton to tables with "colocate_with"
property will fail.
**To Reproduce**
1. Create a table:
```SQL
CREATE TABLE `test` (
`date` date,
`userid` varchar(128)
) ENGINE=OLAP
DUPLICATE KEY(`date`, `userid`)
PARTITION BY RANGE(`date`)()
DISTRIBUTED BY HASH(`userid`) BUCKETS 8
PROPERTIES (
"colocate_with" = "test"
);
```
2. Try to add a partition:
```SQL
ALTER TABLE test add PARTITION p1 VALUES [("2020-10-15"), ("2020-10-16"));
```
3. See the error:
```SQL
ERROR 1064 (HY000): Unexpected exception: null
```
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