presto-spi/src/main/java/io/prestosql/spi/block/LongArrayBlockBuilder.java/LongArrayBlockBuilder/getSingleValueBlock
class LongArrayBlockBuilder:    @Override
    public Block getSingleValueBlock(int position)
    {
        checkReadablePosition(position);
        return new LongArrayBlock(
                0,
                1,
                valueIsNull[position] ? new boolean[] {true} : null,
                new long[] {values[position]});
    }