SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function sum (alias a1) (children 1)
     ExpressionList (children 1)
      Identifier q0.a2
    Function sum (alias a9) (children 1)
     ExpressionList (children 1)
      Identifier q0.a1
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias q0) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Literal UInt64_1 (alias a1)
           Literal UInt64_2 (alias a2)
