docs: public synchronized void writeToCopy(CopyOperationImpl op, byte[] data, int off, int siz)
        throws SQLException {
      if (!hasLock(op)) {
        throw new PSQLException(GT.tr("Tried to write to an inactive copy operation"),
            PSQLState.OBJECT_NOT_IN_STATE);
      }
  
      LOGGER.log(Level.FINEST, " FE=> CopyData({0})", siz);
  
      try {
        pgStream.sendChar('d');
        pgStream.sendInteger4(siz + 4);
        pgStream.send(data, off, siz);
  
        processCopyResults(op, false); // collect any pending notifications without blocking
      } catch (IOException ioe) {
        throw new PSQLException(GT.tr("Database connection failed when writing to copy"),
            PSQLState.CONNECTION_FAILURE, ioe);
      }
    }