feat: Dynamic currency

[richardfogaca]

SUMMARY

Adds dynamic currency detection for chart formatting. When a metric's currency is set to "Auto-detect", Superset queries the dataset's designated currency code column to determine the appropriate currency symbol.

How it works:

• Dataset owners configure a currency_code_column (e.g., a column containing "USD", "EUR", "GBP")
• When building a chart, users select "Auto-detect" in the currency format dropdown
• Backend detects the currency from filtered data:
  • Single currency → formats with that currency symbol
  • Mixed currencies → falls back to neutral numeric formatting

Key changes:

Backend:

• Added currency_code_column field to SqlaTable model with DB migration
• Added detect_currency() utility that queries distinct currencies from filtered data
• Integrated currency detection into both QueryContext API and legacy viz API
• Returns detected_currency in API response for frontend consumption

Frontend:

• Added "Auto-detect" option to CurrencyControl (only shown when dataset has currency_code_column)
• Updated chart plugins to handle AUTO currency resolution: Timeseries, MixedTimeseries, BigNumber variants, Table, PivotTable, Heatmap, Sunburst, Treemap, Pie, Funnel, Gauge
• Refactored DatasourceEditor: moved main_dttm_col from inline radio buttons to a new "Default Column Settings" section alongside currency_code_column

Example data:

• Added international_sales example dataset demonstrating multi-currency transactions across regions

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A - Requires screenshot of:

• Currency code column

• Currency control dropdown with "Auto-detect" option + Chart displaying auto-detected currency formatting

TESTING INSTRUCTIONS

1. Open the international_sales dataset and set "Currency code column" to currency_code
2. Create a new chart (e.g., Big Number Total) using this dataset
3. Select a numeric metric (e.g., revenue)
4. In the "Number Format" section, set currency to "Auto-detect"
5. Apply filters to show single-currency data (e.g., filter by country = USA)
6. Verify the chart displays USD formatting
7. Change filter to show mixed currencies (e.g., all countries)
8. Verify the chart falls back to neutral number formatting

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-193)
  • 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

---

CodeAnt-AI Description

Auto-detect currency from dataset and per-row for chart formatting

What Changed

• Charts can use "Auto-detect" currency: when a dataset defines a currency code column, selecting Auto-detect formats values with the dataset’s currency (or a per-row currency for tables/pivot tables) instead of a fixed symbol.
• Table and PivotTable now perform per-cell currency detection when Auto-detect is selected and the currency column is included in query results; mixed-currency rows fall back to neutral numeric formatting.
• The backend returns a detected_currency value for chart queries; other chart types (timeseries, big number, pie, heatmap, treemap, gauge, etc.) use this dataset-level detection as a fallback when per-row data is not available.
• Currency selector in controls shows an "Auto-detect" option only when the current dataset has a configured currency code column and moves that option to the top of the list.
• Dataset editor exposes a "Default Column Settings" area to pick the currency code column (string columns only) and stores it on datasets; a DB migration and example dataset demonstrating multi-currency data were added.
• Currency formatting behavior: AUTO mode now uses row context when available, then backend-detected currency, and finally neutral formatting for mixed or missing currencies; numerous tests added to cover these cases.

Impact

✅ Clearer currency symbols in charts when dataset provides a currency column
✅ Fewer mixed-currency formatting errors (mixed rows now show neutral numbers)
✅ Auto-detect option only appears when it will work for the selected dataset

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