SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier keycol
    Identifier enum_col
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier table_with_enum
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier table_key
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier keycol
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier keycol