presto-main/src/main/java/io/prestosql/sql/planner/optimizations/IndexJoinOptimizer.java/IndexJoinOptimizer/visitTableScan
class IndexJoinOptimizer:        @Override
        public PlanNode visitTableScan(TableScanNode node, RewriteContext<Context> context)
        {
            return planTableScan(node, BooleanLiteral.TRUE_LITERAL, context.get());
        }