presto-main/src/main/java/io/prestosql/util/JsonUtil.java/JsonUtil/getHashPosition
class JsonUtil:        private int getHashPosition(int position)
        {
            int hashPosition = getMaskedHash(hashPosition(type, block, position));
            while (true) {
                if (positionByHash[hashPosition] == EMPTY_SLOT) {
                    return hashPosition;
                }
                if (positionEqualsPosition(type, block, positionByHash[hashPosition], block, position)) {
                    return hashPosition;
                }
                hashPosition = getMaskedHash(hashPosition + 1);
            }
        }