presto-parquet/src/main/java/io/prestosql/parquet/DictionaryPage.java/DictionaryPage/toString
class DictionaryPage:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("slice", slice)
                .add("dictionarySize", dictionarySize)
                .add("encoding", encoding)
                .add("uncompressedSize", uncompressedSize)
                .toString();
    }