code: private void setFieldToNull(boolean postgresText, String[] transformedStrings, int fieldIndex, Field field) {
          if (postgresText) transformedStrings[fieldIndex + 1] = POSTGRES_NULL_TEXT;
          // Adjust parameter index by two: indexes are one-based and the first one is the CSV line number.
          else try {
              // LOG.info("setting {} index to null", fieldIndex + 2);
              field.setNull(insertStatement, fieldIndex + 2);
          } catch (SQLException e) {
              e.printStackTrace();
              // FIXME: store error here? It appears that an exception should only be thrown if the type value is invalid,
              // the connection is closed, or the index is out of bounds. So storing an error may be unnecessary.
          }
      }
docs: Sets field to null in statement or string array depending on whether postgres is being used.