SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Identifier val
    Function plus (alias prev) (children 1)
     ExpressionList (children 2)
      Identifier val
      Literal UInt64_1
    Function plus (alias val) (children 1)
     ExpressionList (children 2)
      Identifier val
      Identifier prev
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_1 (alias val)
