synchronized (mutex) {
        return delegate().remove(rowKey, columnKey);
      }
    }

    @Override
    public Map<C, V> row(@ParametricNullness R rowKey) {
      synchronized (mutex) {
        return map(delegate().row(rowKey), mutex);
      }
    }

    @Override
    public Map<R, V> column(@ParametricNullness C columnKey) {
      synchronized (mutex) {

   * the function is not invoked). Example usage:
   *
   * <pre>{@code
   * ListenableFuture<QueryResult> queryFuture = ...;
   * ListenableFuture<List<Row>> rowsFuture =
   *     transform(queryFuture, QueryResult::getRows, executor);
   * }</pre>
   *
   * <p>When selecting an executor, note that {@code directExecutor} is dangerous in some cases. See

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