presto-main/src/main/java/io/prestosql/memory/MemoryPoolAssignmentsRequest.java/MemoryPoolAssignmentsRequest/toString
class MemoryPoolAssignmentsRequest:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("version", version)
                .add("assignments", assignments)
                .toString();
    }