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