presto-main/src/main/java/io/prestosql/sql/planner/plan/UnnestNode.java/UnnestNode/replaceChildren
class UnnestNode:    @Override
    public PlanNode replaceChildren(List<PlanNode> newChildren)
    {
        return new UnnestNode(getId(), Iterables.getOnlyElement(newChildren), replicateSymbols, unnestSymbols, ordinalitySymbol, joinType, filter);
    }