presto-main/src/main/java/io/prestosql/sql/planner/optimizations/TableDeleteOptimizer.java/Optimizer/Optimizer
class Optimizer:        private Optimizer(Session session, Metadata metadata, PlanNodeIdAllocator idAllocator)
        {
            this.session = session;
            this.metadata = metadata;
            this.idAllocator = idAllocator;
        }