rusackas opened a new pull request, #34761:
URL: https://github.com/apache/superset/pull/34761
## Summary
This PR fixes an issue where NULL values in categorical x-axis were not
displayed in ECharts bar charts, while they were correctly shown in other chart
types like pie charts.
When a categorical column contains NULL values, these should be displayed as
a valid category labeled as "<NULL>" in the bar chart, providing users
visibility into missing data.
Fixes #31481
## Testing
### Manual Testing
1. Create a table with NULL values in a categorical column:
```sql
CREATE TABLE browser_stats (browser VARCHAR(50), page VARCHAR(50));
INSERT INTO browser_stats (browser, page)
VALUES
('Firefox', 'home'),
('Chrome', 'home'),
('Chrome', 'home'),
('Safari', 'about'),
(NULL, 'about');
```
2. Create a bar chart using browser as the x-axis (categorical)
3. Verify that NULL appears as a category labeled "<NULL>"
### Unit Tests
- Added test case to verify NULL values are converted to `<NULL>` string for
categorical axes
- All existing tests pass
## Before/After
- **Before**: NULL values were filtered out and not displayed
- **After**: NULL values appear as "<NULL>" category in the chart
## Checklist
- [x] Has associated issue: #31481
- [x] Code follows project conventions
- [x] Passes pre-commit checks
- [x] Includes tests
- [ ] Includes documentation (N/A - bug fix)
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