Re: [HACKERS] Re: [INTERFACES] Group/Order by not in target - Was [NEW ODBC DRIVER]

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От Bruce Momjian
Тема Re: [HACKERS] Re: [INTERFACES] Group/Order by not in target - Was [NEW ODBC DRIVER]
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Msg-id 199805151351.JAA10949@candle.pha.pa.us
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Ответ на Re: [INTERFACES] Group/Order by not in target - Was [NEW ODBC DRIVER]  ("Jose' Soares Da Silva" <sferac@bo.nettuno.it>)
Список pgsql-hackers
>
> On Mon, 11 May 1998, David Hartwig wrote:
>
>
> > It is not very difficult to produce this problem in MS Access 97;  I
> > expect my users to beat me up pretty good on this issue.  Thus, I plan to
> > look into making the fix in the backend myself.  Conceptually it does not
> > seem too difficult.
> >
> > 1. Add a hidden attribute to the target node structure.
> >
> > 2. Modify the parser/analyzer to add any attributes in the GROUP/ORDER BY
> > clause that are missing from the target list, to the target list with the
> > hidden attribute set.
> This would be a great enhancement!
> SQL92 specifies that columns in the ORDER BY must appear in the
> SELECT clause, but this limitation has no sense, indeed many databases
> already implement this enhancement.
> Go for it!

There already is code in the backend for Junk fields to be removed.  Not
sure what it does, though.
--
Bruce Momjian                          |  830 Blythe Avenue
maillist@candle.pha.pa.us              |  Drexel Hill, Pennsylvania 19026
  +  If your life is a hard drive,     |  (610) 353-9879(w)
  +  Christ can be your backup.        |  (610) 853-3000(h)

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