rusackas opened a new pull request, #40617:
URL: https://github.com/apache/superset/pull/40617

   ### SUMMARY
   
   This is a **test-only PR** opened as a TDD-style validation of issue #30330.
   
   #30330 reports that the Histogram chart fails with a database error when a 
"filter by metric" (HAVING clause) is added. rusackas confirmed the bug is 
still live on master.
   
   **Root cause:** `buildQuery.ts` unconditionally sets `metrics: undefined`. 
Any HAVING-clause `adhoc_filter` therefore produces SQL with a `HAVING` clause 
but no aggregated metric or `GROUP BY` — invalid SQL that Druid (and most 
databases) reject.
   
   This PR adds a `buildQuery` test with three cases:
   
   1. **`should build query with column and no metrics`** — baseline: histogram 
sends no metrics (passes today).
   2. **`should include groupby columns in query columns`** — groupby 
passthrough (passes today).
   3. **`Regression for #30330`** — asserts that when a HAVING `adhoc_filter` 
is present, `query.metrics` is defined and non-empty. **Fails today** (metrics 
is always `undefined`).
   
   ### How to interpret CI
   
   - **CI red** → bug is live. Fix target: `buildQuery.ts` — detect HAVING 
`adhoc_filters` and preserve or synthesise a `COUNT(*)` metric so the HAVING 
clause has an aggregated value to filter on.
   - **CI green** → bug fixed; merge closes #30330 and locks in the regression 
guard.
   
   ### TESTING INSTRUCTIONS
   
   ```bash
   cd superset-frontend
   npm run test -- 
plugins/plugin-chart-echarts/test/Histogram/buildQuery.test.ts --no-coverage
   ```
   
   ### ADDITIONAL INFORMATION
   
   - [x] Has associated issue: closes #30330
   - [ ] Required feature flags: N/A
   - [ ] Changes UI: No
   - [ ] Includes DB Migration: No
   - [ ] Introduces new feature or API: No
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)


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