AlterQuery  video_log (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_PROJECTION (children 1)
   Projection (children 1)
    ProjectionSelectQuery (children 2)
     ExpressionList (children 4)
      Function toStartOfHour (alias hour) (children 1)
       ExpressionList (children 1)
        Identifier datetime
      Identifier domain
      Function sum (children 1)
       ExpressionList (children 1)
        Identifier bytes
      Function avg (children 1)
       ExpressionList (children 1)
        Identifier duration
     ExpressionList (children 2)
      Identifier hour
      Identifier domain
 Identifier video_log