presto-memory/src/main/java/io/prestosql/plugin/memory/MemoryTableHandle.java/MemoryTableHandle/toString
class MemoryTableHandle:    @Override
    public String toString()
    {
        StringBuilder builder = new StringBuilder();
        builder.append(id);
        limit.ifPresent(value -> builder.append("(limit:" + value + ")"));
        sampleRatio.ifPresent(value -> builder.append("(sampleRatio:" + value + ")"));
        return builder.toString();
    }