presto-spi/src/main/java/io/prestosql/spi/block/LongArrayBlockBuilder.java/LongArrayBlockBuilder/appendNull
class LongArrayBlockBuilder:    @Override
    public BlockBuilder appendNull()
    {
        if (values.length <= positionCount) {
            growCapacity();
        }

        valueIsNull[positionCount] = true;

        hasNullValue = true;
        positionCount++;
        if (blockBuilderStatus != null) {
            blockBuilderStatus.addBytes(Byte.BYTES + Long.BYTES);
        }
        return this;
    }