codeant-ai-for-open-source[bot] commented on PR #38170:
URL: https://github.com/apache/superset/pull/38170#issuecomment-3941654327
## **Sequence Diagram**
This PR ensures CSV_EXPORT settings (sep and decimal) are applied for both
client-side (pivot/processed) CSV generation and server-side streaming exports.
The diagram shows the two main success paths where the app config is read and
applied to produce correctly formatted CSV output.
```mermaid
sequenceDiagram
participant User
participant Frontend
participant Backend
participant AppConfig
participant Database
User->>Frontend: Request CSV export (regular or pivot)
Frontend->>Backend: Export request
Backend->>AppConfig: Read CSV_EXPORT (sep, decimal)
alt Client/processed CSV (apply_client_processing)
Backend->>Backend: processed_df.to_csv(..., **CSV_EXPORT)
Backend-->>Frontend: CSV data (respecting sep & decimal)
else Streaming SQL export
Backend->>AppConfig: Read CSV_EXPORT (sep, decimal)
Backend->>Database: Execute streaming query
Database-->>Backend: Rows stream
Backend->>Backend: csv.writer(delimiter=sep) & format floats
(decimal)
Backend-->>Frontend: Streamed CSV chunks (respecting sep & decimal)
```
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