SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function arraySort (children 1)
     ExpressionList (children 1)
      Function groupArrayMerge (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)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 2)
           Function groupArrayState (alias x) (children 1)
            ExpressionList (children 1)
             Identifier a
           Function groupArrayState (alias y) (children 1)
            ExpressionList (children 1)
             Identifier b
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier add_aggregate
