dosubot[bot] commented on issue #35682:
URL: https://github.com/apache/superset/issues/35682#issuecomment-3410236144
<!-- Answer -->
The 400 error happens because the backend expects the engine field to be a
string (like "bigquery"), not an object. The correct payload should look like:
```json
{
"sql": "SELECT ...",
"engine": "bigquery"
}
```
This is enforced by the backend schema and confirmed in the frontend code,
which should send engine as a string, not as { "backend": "bigquery" }
([reference](https://github.com/apache/superset/blob/master/superset-frontend/src/explore/components/controls/ViewQuery.tsx),
[backend
schema](https://github.com/apache/superset/blob/master/superset/sqllab/schemas.py)).
The regression likely comes from a recent frontend change that started passing
the whole backend object instead of just the string. Updating the frontend to
send only the backend string should resolve the issue.
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