anchor.diff:  |count()
   |
   |java.lang.Long
  -|number of rows, similar to _count(*)_ in SQL
  +|number of rows, similar to `count(*)` in SQL
   
   |count(_expression_)
   |any
  
positive.code: |rowNumber()
  |
  |java.lang.Long
  |number of the current row within its partition, counting from 0
  
  |rank()
  |
  
negative.code: |count()
  |
  |java.lang.Long
  |number of rows, similar to `count(*)` in SQL
  
  |count(_expression_)
  |any
  