presto-main/src/main/java/io/prestosql/cost/CostCalculatorUsingExchanges.java/CostEstimator/visitTableScan
class CostEstimator:        @Override
        public PlanCostEstimate visitTableScan(TableScanNode node, Void context)
        {
            // TODO: add network cost, based on input size in bytes? Or let connector provide this cost?
            LocalCostEstimate localCost = LocalCostEstimate.ofCpu(getStats(node).getOutputSizeInBytes(node.getOutputSymbols(), types));
            return costForSource(node, localCost);
        }