presto-orc/src/main/java/io/prestosql/orc/reader/LongColumnReader.java/LongColumnReader/readNullBlock
class LongColumnReader:    private Block readNullBlock(boolean[] isNull, int nonNullCount)
            throws IOException
    {
        if (type instanceof BigintType) {
            return longReadNullBlock(isNull, nonNullCount);
        }
        if (type instanceof IntegerType || type instanceof DateType) {
            return intReadNullBlock(isNull, nonNullCount);
        }
        if (type instanceof SmallintType) {
            return shortReadNullBlock(isNull, nonNullCount);
        }
        throw new VerifyError("Unsupported type " + type);
    }