presto-spi/src/main/java/io/prestosql/spi/block/Int128ArrayBlock.java/Int128ArrayBlock/getRegion
class Int128ArrayBlock:    @Override
    public Block getRegion(int positionOffset, int length)
    {
        checkValidRegion(getPositionCount(), positionOffset, length);

        return new Int128ArrayBlock(positionOffset + this.positionOffset, length, valueIsNull, values);
    }