jesperct opened a new pull request, #39972: URL: https://github.com/apache/superset/pull/39972
### SUMMARY Stacked bar charts (and other ECharts time-series charts) configured with a temporal x-axis and Time Grain set to **None** could render a spurious label like `.345ms` or `:49s` at the right edge of the axis, after the last legitimate data label. The value comes from ECharts auto-generating an axis tick at the very end of the data range; that tick lands on a sub-minute timestamp, and the SMART_DATE multi-format renders it through its millisecond / second buckets (`.%Lms`, `:%Ss`) which then bleed into the visible labels. `getSmartDateFormatter` in `superset-frontend/plugins/plugin-chart-echarts/src/utils/formatters.ts` already had a wrapper that strips milliseconds, but it was only applied when an explicit `timeGrain` was provided — the no-time-grain branch returned the raw smart-date formatter and skipped the strip. This change always wraps, normalizes the date by zeroing milliseconds, and additionally returns an empty string for any tick that lands on a non-zero seconds boundary when no time grain is set. Real data points align to at least the minute level for any practical chart, so this only suppresses ECharts auto-generated artifacts at the axis edge. ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF Before — rightmost label is `April.345ms`:  After — phantom label is gone, axis ends cleanly at `April`. ### TESTING INSTRUCTIONS 1. Connect any database with a table containing a `DATE` or `TIMESTAMP` column. 2. Create a new ECharts Bar Chart. 3. Set X-axis to the date column. 4. Set Time Grain to **None**. 5. Add a numeric metric and a string dimension. 6. In Customize, set Stacked Style to Stack. 7. Update the chart and inspect the rightmost x-axis label. It should match the rest of the labels (e.g., a month or year) with no `.XXXms` or `:XXs` artifact appended. 8. Run `npm test plugins/plugin-chart-echarts/test/utils/formatters.test.ts` — added regression test covers the formatter contract directly. ### ADDITIONAL INFORMATION - [ ] Has associated issue: - [ ] Required feature flags: - [x] Changes UI - [ ] Includes DB Migration - [ ] Introduces new feature or API - [ ] Removes existing feature or API -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
