presto-spi/src/main/java/io/prestosql/spi/block/Int128ArrayBlockBuilder.java/Int128ArrayBlockBuilder/build
class Int128ArrayBlockBuilder:    @Override
    public Block build()
    {
        if (!hasNonNullValue) {
            return new RunLengthEncodedBlock(NULL_VALUE_BLOCK, positionCount);
        }
        return new Int128ArrayBlock(0, positionCount, hasNullValue ? valueIsNull : null, values);
    }