presto-main/src/main/java/io/prestosql/sql/planner/plan/PlanNodeId.java/PlanNodeId/equals
class PlanNodeId:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        PlanNodeId that = (PlanNodeId) o;

        if (!id.equals(that.id)) {
            return false;
        }

        return true;
    }