runAggregation ::
        [RAggOperation]  -- ^ Input Aggregate Operations
    ->  RTable          -- ^ Input RTable
    ->  RTable          -- ^ Output singleton RTable
runAggregation [] rtab = rtab
runAggregation ::
        [RAggOperation]  -- ^ Input Aggregate Operations
    ->  RTable          -- ^ Input RTable
    ->  RTable
runAggregation [] rtab = rtab
runAggregation [] rtab = rtab