Function render_fetch_work 

pub fn render_fetch_work<'scope, T, S, F>(
    scope: Scope<'scope, T>,
    collection_id: GlobalId,
    source: S,
    format: F,
    work_requests: StreamVec<'scope, T, Result<F::WorkRequest<S>, StorageErrorX>>,
) -> (StreamVec<'scope, T, Result<F::RecordChunk, StorageErrorX>>, PressOnDropButton)
where
    T: Timestamp,
    S: OneshotSource + Sync + 'static,
    F: OneshotFormat + Sync + 'static,

Render an operator that given a stream OneshotFormat::WorkRequests will fetch chunks of the remote OneshotSource::Object and return a stream of OneshotFormat::RecordChunks that can be decoded into Rows.