code: public long copyIn(final String sql, InputStream from) throws SQLException, IOException {
      return copyIn(sql, from, DEFAULT_BUFFER_SIZE);
    }
docs: Use COPY FROM STDIN for very fast copying from an InputStream into a database table.
  
  @param sql COPY FROM STDIN statement
  @param from a CSV file or such
  @return number of rows updated for server 8.2 or newer; -1 for older
  @throws SQLException on database usage issues
  @throws IOException upon input stream or database connection failure