cube-js/cube · error

Second argument must be a JsBox<Arc<QueryResult>> or a JsBuf

Error message

Second argument must be a JsBox<Arc<QueryResult>> or a JsBuffer with columnar JsRawColumnarData JSON

What it means

extract_query_result accepts exactly two shapes for its argument — a JsBox holding an Arc<QueryResult> (from a prior native call) or a JsBuffer containing JsRawColumnarData columnar JSON (from the JS side). This error means the downcast to both failed: the JS value passed as the second argument is neither of those shapes.

Source

Thrown at packages/cubejs-backend-native/src/orchestrator.rs:234

        Err(err) => cx.throw_error(err.to_string()),
    }
}

fn extract_query_result(
    cx: &mut FunctionContext<'_>,
    data_arg: Handle<JsValue>,
) -> Result<Arc<QueryResult>, anyhow::Error> {
    if let Ok(js_box) = data_arg.downcast::<JsBox<Arc<QueryResult>>, _>(cx) {
        Ok(Arc::clone(&js_box))
    } else if let Ok(js_buffer) = data_arg.downcast::<JsBuffer, _>(cx) {
        let bytes = js_buffer.as_slice(cx);
        let js_raw_data: JsRawColumnarData = serde_json::from_slice(bytes)?;

        QueryResult::from_js_raw_data(js_raw_data)
            .map(Arc::new)
            .map_err(anyhow::Error::from)
    } else {
        Err(anyhow::anyhow!(
            "Second argument must be a JsBox<Arc<QueryResult>> or a JsBuffer with columnar JsRawColumnarData JSON"
        ))
    }
}

pub fn parse_cubestore_result_message(mut cx: FunctionContext) -> JsResult<JsPromise> {
    let msg = cx.argument::<JsBuffer>(0)?;
    let msg_data = msg.as_slice(&cx).to_vec();

    let promise = cx
        .task(move || QueryResult::from_cubestore_fb(&msg_data))
        .promise(move |mut cx, res| match res {
            Ok(result) => Ok(cx.boxed(Arc::new(result))),
            Err(err) => cx.throw_error(err.to_string()),
        });

    Ok(promise)
}

View on GitHub (pinned to 7d981676b3)

Solutions

1. Pass the QueryResult object obtained from a previous native API call directly
2. When sending raw columnar data, serialize JsRawColumnarData-conformant JSON into a Node Buffer and pass that buffer as the second argument

When it happens

Trigger: Thrown at packages/cubejs-backend-native/src/orchestrator.rs:234 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of cube-js/cube@7d981676b3 (2026-09-02). Data as JSON: /api/errors/85780c6c2258a4e8. Report an issue: GitHub.