presto-main/src/main/java/io/prestosql/sql/planner/sanity/ValidateDependenciesChecker.java/ValidateDependenciesChecker/visitTableScan
class ValidateDependenciesChecker:        @Override
        public Void visitTableScan(TableScanNode node, Set<Symbol> boundSymbols)
        {
            //We don't have to do a check here as TableScanNode has no dependencies.
            return null;
        }