SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function sumMerge (children 1)
     ExpressionList (children 1)
      Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Function plus (alias x) (children 1)
            ExpressionList (children 2)
             Function sumState (children 1)
              ExpressionList (children 1)
               Identifier a
             Function sumState (children 1)
              ExpressionList (children 1)
               Function toInt32 (children 1)
                ExpressionList (children 1)
                 Identifier b
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier add_aggregate
