akizminet opened a new issue #16951:
URL: https://github.com/apache/superset/issues/16951
Boxplot only shows a `<NULL>` on the example chart.
Generated query:
```sql
SELECT DATE_TRUNC('day', year) AS year,
region AS region,
sum("SP_POP_TOTL") AS "sum__SP_POP_TOTL"
FROM wb_health_population
WHERE year >= TO_TIMESTAMP('1960-01-01 00:00:00.000000', 'YYYY-MM-DD
HH24:MI:SS.US')
AND year < TO_TIMESTAMP('2021-10-04 04:03:20.000000', 'YYYY-MM-DD
HH24:MI:SS.US')
GROUP BY DATE_TRUNC('day', year),
region
LIMIT 50000;
```
#### How to reproduce the bug
1. Clone superset from github and start with `docker-compose -f
docker-compose-non-dev.yml up -d`
2. Login and go to Chart. Choose Box plot
3. See error
### Expected results
Boxplot shows multiple regions in x-axis
### Actual results
Boxplot only shows a NULL in x-axis
#### Screenshots
### Environment
- browser type and version: Chrome 94
- superset version: `Superset 0.0.0dev`
- python version: `3.7.9`
- any feature flags active: None
### Checklist
Make sure to follow these steps before submitting your issue - thank you!
- [x] I have reproduced the issue with at least the latest released version
of superset.
- [x] I have checked the issue tracker for the same issue and I haven't
found one similar.
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