dosubot[bot] commented on issue #42834:
URL: https://github.com/apache/superset/issues/42834#issuecomment-5202453610

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   <!-- Answer -->
   Sure! Here's a rough outline for approach #2 — making the existing 
`number_format` control apply to percentages when the user picks a 
percentage-style D3 format (like `.0%`, `.1%`).
   
   All changes are in 
`superset-frontend/plugins/plugin-chart-echarts/src/Pie/transformProps.ts` 
[[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-echarts/src/Pie/transformProps.ts).
   
   ***
   
   **1. Add a helper to detect percentage formats** (after line 57, near the 
existing `percentFormatter`):
   
   ```typescript
   const percentFormatter = getNumberFormatter(NumberFormats.PERCENT_2_POINT);
   
   function isPercentageFormat(format?: string): boolean {
     return !!format && /\.?\d*%/.test(format);
   }
   ```
   
   **2. Create a smart formatter inside `transformProps`** (after line ~183, 
where `numberFormatter` is created):
   
   ```typescript
   // If the user chose a %-style D3 format, use it for percentages too;
   // otherwise fall back to the default 2-decimal formatter.
   const activePercentFormatter = isPercentageFormat(numberFormat)
     ? getNumberFormatter(numberFormat)
     : percentFormatter;
   ```
   
   **3. Update `parseParams` to accept a custom percent formatter** (lines 
59–73):
   
   ```typescript
   export function parseParams({
     params,
     numberFormatter,
     percentFormatterOverride = percentFormatter, // new, optional
     sanitizeName = false,
   }: {
     params: Pick<CallbackDataParams, 'name' | 'value' | 'percent'>;
     numberFormatter: ValueFormatter;
     percentFormatterOverride?: ValueFormatter;
     sanitizeName?: boolean;
   }): string[] {
     // ...
     const formattedPercent = percentFormatterOverride((percent as number) / 
100);
     // ...
   }
   ```
   
   **4. Pass it through at all call sites:**
   
   - **Label formatter** (~line 331):
   
     ```typescript
     const [name, formattedValue, formattedPercent] = parseParams({
       params,
       numberFormatter,
       percentFormatterOverride: activePercentFormatter,
     });
     ```
   
   - **Tooltip formatter** (~line 422):
   
     ```typescript
     const [name, formattedValue, formattedPercent] = parseParams({
       params,
       numberFormatter,
       percentFormatterOverride: activePercentFormatter,
       sanitizeName: true,
     });
     ```
   
   - **"Other" category tooltips** (lines ~208 and ~216) — swap 
`percentFormatter(...)` → `activePercentFormatter(...)`.
   
   ***
   
   **What to test:**
   
   - Label types that include percentages: `Percent`, `KeyPercent`, 
`ValuePercent`, `KeyValuePercent`
   - Tooltips (regular slices + the "Other" bucket)
   - Non-percentage `number_format` values (e.g. `,.2f`) — these should leave 
percentage labels at the default 2-decimal behavior
   - Percentage `number_format` values (e.g. `.0%`, `.1%`) — these should now 
control the percentage labels
   
   This keeps backward compatibility: if the user's format isn't a `%`-style 
format, everything behaves exactly as before.
   
   
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