presto-spi/src/main/java/io/prestosql/spi/block/Int128ArrayBlockBuilder.java/Int128ArrayBlockBuilder/getRegion
class Int128ArrayBlockBuilder:    @Override
    public Block getRegion(int positionOffset, int length)
    {
        checkValidRegion(getPositionCount(), positionOffset, length);

        if (!hasNonNullValue) {
            return new RunLengthEncodedBlock(NULL_VALUE_BLOCK, length);
        }
        return new Int128ArrayBlock(positionOffset, length, hasNullValue ? valueIsNull : null, values);
    }