presto-spi/src/main/java/io/prestosql/spi/block/DictionaryBlock.java/DictionaryBlock/getLoadedBlock
class DictionaryBlock:    @Override
    public Block getLoadedBlock()
    {
        Block loadedDictionary = dictionary.getLoadedBlock();

        if (loadedDictionary == dictionary) {
            return this;
        }
        return new DictionaryBlock(idsOffset, getPositionCount(), loadedDictionary, ids, false, randomDictionaryId());
    }