lgbo-ustc opened a new issue, #9032:
URL: https://github.com/apache/incubator-gluten/issues/9032
### Backend
CH (ClickHouse)
### Bug description
[Expected behavior] and [actual behavior].
With
`spark.gluten.sql.columnar.backend.ch.enable.coalesce.project.union=true`,
following query throws an exception
```sql
elect n_regionkey as k1 , n_nationkey as k2, array() as arr from
tpch_pq.nation union all select n_nationkey as k1, n_regionkey as k2,
array('1232') as arr from tpch_pq.nation;
```
```
Caused by: org.apache.gluten.exception.GlutenException: Cannot convert NULL
to a non-nullable type
```
### Spark version
None
### Spark configurations
_No response_
### System information
_No response_
### Relevant logs
```bash
```
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