anchor.diff:  
   The RETURN clause
   
  -.[[Q7]]Q7
  +.[[Q6]]Q6
   [source, cypher]
   ----
   RETURN a AS a, (b - b) + SUM(c) AS foo
  
positive.code: ====
  By the grouping and aggregation semantics, the RETURN clause
  
  .[[Q6]]Q6
  [source, cypher]
  ----
  RETURN a AS a, b + SUM(c) * 2 AS foo
  
negative.code: ====
  A less artificial example is calculating the total gross of an order as the discounted sum of the net values –– product price multiplied by amount –– of the order's line items in query such as:
  
  [source, cypher]
  ----
  MATCH
  