presto-main/src/main/java/io/prestosql/sql/planner/DistributedExecutionPlanner.java/DistributedExecutionPlanner/visitTableScan
class DistributedExecutionPlanner:        @Override
        public Map<PlanNodeId, SplitSource> visitTableScan(TableScanNode node, Void context)
        {
            return visitScanAndFilter(node, Optional.empty());
        }