SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    QualifiedAsterisk (children 1)
     Identifier t1
    QualifiedAsterisk (children 1)
     Identifier t2
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t2
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t1
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier x
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier t1.x
    OrderByElement (children 1)
     Identifier t2.x
