presto-main/src/main/java/io/prestosql/util/JsonUtil.java/HashTable/HashTable
class HashTable:        public HashTable(Type type, BlockBuilder block)
        {
            this.type = requireNonNull(type, "type is null");
            this.block = requireNonNull(block, "block is null");

            hashCapacity = arraySize(EXPECTED_ENTRIES, FILL_RATIO);
            this.maxFill = calculateMaxFill(hashCapacity);
            this.hashMask = hashCapacity - 1;
            positionByHash = new int[hashCapacity];
            Arrays.fill(positionByHash, EMPTY_SLOT);
        }