presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/model/AccumuloColumnHandle.java/AccumuloColumnHandle/toString
class AccumuloColumnHandle:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("name", name)
                .add("columnFamily", family.orElse(null))
                .add("columnQualifier", qualifier.orElse(null))
                .add("type", type)
                .add("ordinal", ordinal)
                .add("comment", comment)
                .add("indexed", indexed)
                .toString();
    }