SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test2
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier test1
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier test2.col1
        Identifier test1.col1
   Function isNull (children 1)
    ExpressionList (children 1)
     Identifier test2.col1
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier test2.col1