SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Literal NULL
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier 01902_db_repr.t_merge
   Identifier n
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier _table
