// ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsGroupCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    protected BsGroupCA doGetConditionAggregation() {

    // ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsUserInfoCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    protected BsUserInfoCA doGetConditionAggregation() {

    // ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsBadWordCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    protected BsBadWordCA doGetConditionAggregation() {

    //                                                                         Aggregation
    //                                                                         ===========
    public BsElevateWordCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    // ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsJobLogCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    protected BsJobLogCA doGetConditionAggregation() {

    //                                                                         Aggregation
    //                                                                         ===========
    public BsPathMappingCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    //                                                                         Aggregation
    //                                                                         ===========
    public BsThumbnailQueueCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

          + aggregateAboveRange(aggr, node.left);
    }
  }

  @Override
  public int size() {
    return Ints.saturatedCast(aggregateForEntries(Aggregate.SIZE));
  }

  @Override
  int distinctElements() {
    return Ints.saturatedCast(aggregateForEntries(Aggregate.DISTINCT));
  }

  private static int distinctElements(@Nullable AvlNode<?> node) {
    return (node == null) ? 0 : node.distinctElements;
  }

  void MarkAsResult(AbstractTensorHandle* gradient) const override;

  void DeleteGradient(AbstractTensorHandle* gradient) const override;

 private:
  // The context where the aggregation op `Add` is to be created.
  AbstractContext* ctx_;
};

// Returns the number of elements in the gradient tensor.
int64_t TapeVSpace::NumElements(AbstractTensorHandle* tensor) const {

    // ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsFileConfigCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }