presto-parquet/src/main/java/io/prestosql/parquet/predicate/DictionaryDescriptor.java/DictionaryDescriptor/DictionaryDescriptor
class DictionaryDescriptor:    public DictionaryDescriptor(ColumnDescriptor columnDescriptor, Optional<DictionaryPage> dictionaryPage)
    {
        this.columnDescriptor = columnDescriptor;
        this.dictionaryPage = dictionaryPage;
    }