presto-orc/src/main/java/io/prestosql/orc/metadata/OrcType.java/OrcType/toString
class OrcType:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("orcTypeKind", orcTypeKind)
                .add("fieldTypeIndexes", fieldTypeIndexes)
                .add("fieldNames", fieldNames)
                .toString();
    }