presto-main/src/main/java/io/prestosql/execution/scheduler/AllAtOnceExecutionSchedule.java/AllAtOnceExecutionSchedule/visitIndexJoin
class AllAtOnceExecutionSchedule:        @Override
        public Void visitIndexJoin(IndexJoinNode node, Void context)
        {
            node.getProbeSource().accept(this, context);
            node.getIndexSource().accept(this, context);
            return null;
        }