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