presto-main/src/main/java/io/prestosql/sql/planner/plan/TopNRowNumberNode.java/TopNRowNumberNode/replaceChildren
class TopNRowNumberNode:    @Override
    public PlanNode replaceChildren(List<PlanNode> newChildren)
    {
        return new TopNRowNumberNode(getId(), Iterables.getOnlyElement(newChildren), specification, rowNumberSymbol, maxRowCountPerPartition, partial, hashSymbol);
    }