presto-spi/src/main/java/io/prestosql/spi/block/DictionaryBlock.java/DictionaryBlock/DictionaryBlock
class DictionaryBlock:    public DictionaryBlock(int positionCount, Block dictionary, int[] ids, boolean dictionaryIsCompacted)
    {
        this(0, positionCount, dictionary, ids, dictionaryIsCompacted, randomDictionaryId());
    }