Function execute_stream 

pub fn execute_stream(
    plan: Arc<dyn ExecutionPlan>,
    context: Arc<TaskContext>,
) -> Result<Pin<Box<dyn RecordBatchStream<Item = Result<RecordBatch, DataFusionError>> + Send>>, DataFusionError>

Execute the ExecutionPlan and return a single stream of RecordBatches.

See collect to buffer the RecordBatches in memory.

Aborting Execution

Dropping the stream will abort the execution of the query, and free up any allocated resources