fix(echarts-timeseries-combined-labels): combine annotation labels for events at same timestamp

[massucattoj]

SUMMARY

Refactors transformIntervalAnnotation and transformEventAnnotation in the ECharts Timeseries plugin to group annotations that share the same timestamp.

Problem: When multiple event or interval annotations had the same start time, each annotation created its own series, resulting in overlapping labels and visual clutter.

Solution: Annotations at the same timestamp are now combined into a single series with their labels joined by newlines. This produces cleaner rendering and better performance by reducing the number of series created.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

BEFORE:

AFTER:

TESTING INSTRUCTIONS

1. Create a table chart following the instructions here (you can use a Google Sheet for this). You can also use this Google sheet.
2. Then, create a Line chart and add a new annotation layer on it
3. After this, you select the Annotation Layer type, Interval or Event
4. Then the annotation source Table
5. As the next step, you select the table chart you created in step
6. This reloads the annotation windows to show the specific options associated with the table
7. Define the Interval start column/Event time column by using the start_date column that has the table chart
8. Add the annotation by clicking on the Apply button

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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• Files reviewed - 2 · Commit Range: d354592..d354592

  • superset-frontend/plugins/plugin-chart-echarts/src/Timeseries/transformers.ts
  • superset-frontend/plugins/plugin-chart-echarts/test/utils/transformers.test.ts
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