SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t2
     TableJoin (children 1)
      Function or (children 1)
       ExpressionList (children 2)
        Function and (children 1)
         ExpressionList (children 2)
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.x
            Identifier t2.x
          Function and (children 1)
           ExpressionList (children 2)
            Function isNotNull (children 1)
             ExpressionList (children 1)
              Identifier t2.x
            Function isNotNull (children 1)
             ExpressionList (children 1)
              Identifier t1.x
        Function and (children 1)
         ExpressionList (children 2)
          Function isNull (children 1)
           ExpressionList (children 1)
            Identifier t2.x
          Function isNull (children 1)
           ExpressionList (children 1)
            Identifier t1.x
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier t1.x
