presto-orc/src/main/java/io/prestosql/orc/reader/DecimalColumnReader.java/DecimalColumnReader/readNonNullBlock
class DecimalColumnReader:    private Block readNonNullBlock()
            throws IOException
    {
        Block block;
        if (type.isShort()) {
            block = readShortNotNullBlock();
        }
        else {
            block = readLongNotNullBlock();
        }
        return block;
    }