code: func (c *InternalClient) FragmentBlocks(ctx context.Context, uri *pilosa.URI, index, field, view string, shard uint64) ([]pilosa.FragmentBlock, error) {
  	span, ctx := tracing.StartSpanFromContext(ctx, "InternalClient.FragmentBlocks")
  	defer span.Finish()
  
  	if uri == nil {
  		uri = c.defaultURI
  	}
  	u := uriPathToURL(uri, "/internal/fragment/blocks")
  	u.RawQuery = url.Values{
  		"index": {index},
  		"field": {field},
  		"view":  {view},
  		"shard": {strconv.FormatUint(shard, 10)},
  	}.Encode()
  
  	// Build request.
  	req, err := http.NewRequest("GET", u.String(), nil)
  	if err != nil {
  		return nil, errors.Wrap(err, "creating request")
  	}
  
  	req.Header.Set("User-Agent", "pilosa/"+pilosa.Version)
  	req.Header.Set("Accept", "application/json")
  
  	// Execute request.
  	resp, err := c.executeRequest(req.WithContext(ctx))
  	if err != nil {
  		// Return the appropriate error.
  		if resp != nil && resp.StatusCode == http.StatusNotFound {
  			return nil, pilosa.ErrFragmentNotFound
  		}
  		return nil, err
  	}
  	defer resp.Body.Close()
  
  	// Decode response object.
  	var rsp getFragmentBlocksResponse
  	if err := json.NewDecoder(resp.Body).Decode(&rsp); err != nil {
  		return nil, errors.Wrap(err, "decoding")
  	}
  	return rsp.Blocks, nil
  }
docs: // FragmentBlocks returns a list of block checksums for a fragment on a host.
  // Only returns blocks which contain data.