SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Function concat (alias id) (children 1)
     ExpressionList (children 2)
      Identifier t2.id
      Literal \'_1\'
    Identifier t1.val
   TablesInSelectQuery (children 3)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t2
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1.id
        Identifier t2.id
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t3
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier id
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier t1.val
   Set
