SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function plus (alias x) (children 1)
     ExpressionList (children 2)
      Identifier number
      Literal UInt64_1
   ExpressionList (children 2)
    Function intDiv (alias y) (children 1)
     ExpressionList (children 2)
      Identifier number
      Literal UInt64_3
    Function sum (children 1)
     ExpressionList (children 1)
      Function plus (children 1)
       ExpressionList (children 2)
        Identifier x
        Identifier y
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function numbers (children 1)
       ExpressionList (children 1)
        Literal UInt64_7