presto-main/src/main/java/io/prestosql/sql/planner/optimizations/AddExchanges.java/AddExchanges/visitTableScan
class AddExchanges:        @Override
        public PlanWithProperties visitTableScan(TableScanNode node, PreferredProperties preferredProperties)
        {
            return planTableScan(node, TRUE_LITERAL)
                    .orElseGet(() -> new PlanWithProperties(node, deriveProperties(node, ImmutableList.of())));
        }