tomerkl65 opened a new pull request, #41907:
URL: https://github.com/apache/superset/pull/41907
### SUMMARY
Adds a hierarchical drill-down interaction for ECharts charts. The chart
author
defines an ordered list of columns in a new **Drill-down hierarchy** control.
On a dashboard, left-clicking a data point drills to the next level scoped to
the clicked value, shows a breadcrumb for navigating back up, and emits a
cross-filter for the full drill path so other charts stay in sync.
Design decisions:
- **Dedicated `drilldown_hierarchy` control** — the x-axis control stays a
single (scalar) column, so existing charts and all downstream query
consumers are unaffected. No global `multi` change, no feature flag needed.
- **Full-path cross-filter** — emitted centrally by the DrillDownHost (which
owns the drill stack), so downstream charts are scoped to the entire path,
not just the deepest clicked column.
- **Leaf selection** narrows the drilled chart to the clicked value at the
deepest level, consistently across charts.
Supported charts: Bar, Line, Area, Scatter, Smooth Line, Step (x-axis based)
and Pie, Funnel, Gauge, Radar, Box Plot (groupby based).
### TESTING INSTRUCTIONS
1. Create a Bar chart, set a single X-axis column, open **Drill-down
hierarchy**
and add the deeper levels; save and add to a dashboard.
2. Click a bar → chart drills to the next level scoped to the clicked value;
a
breadcrumb appears.
3. Confirm other dashboard charts are cross-filtered by the full path.
4. Use the breadcrumb to navigate back up; verify the chart restores.
5. Repeat with a groupby chart (e.g. Pie).
### ADDITIONAL INFORMATION
- [ ] Has associated issue:
- [ ] Required feature flags:
- [x] Changes UI
- [ ] Includes DB Migration
- [x] Introduces new feature or API
- [ ] Removes existing feature or API
<img width="1776" height="994" alt="image"
src="https://github.com/user-attachments/assets/b0983fa5-010e-4899-bbf5-c0711c29e5c2";
/>
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