Removed unnecessary variable

src/sum.cpp

@@ -19,7 +19,6 @@ int64_t sum_extendedprice(const std::string& file_name) {
     CsvParser lineitem = CsvParser(f).delimiter('|');
 
     int64_t price_sum = 0;
-    uint64_t field_number = 0;
     for (auto row : lineitem) {
         price_sum += ToInt(row[5]);
     }