From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Jan Wieck <jwieck(at)debis(dot)com> |
Cc: | pgsql-hackers(at)postgreSQL(dot)org |
Subject: | Re: [HACKERS] Open 6.5 items |
Date: | 1999-05-19 18:30:01 |
Message-ID: | 199905191830.OAA06402@candle.pha.pa.us |
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Thread: | |
Lists: | pgsql-hackers |
> > resno's, sublevelsup corrupt when reaching rewrite system
>
> Don't remember exactly how I produced them. Haven't seen
> them again after the latest changes in the rule system. I
> think it was due to incorrect handling of unrewritten TLE's
> from group by clauses, which are now pulled out of the main
> targetlist.
Removed. I suspected you had fixed it with your last GROUP patch,
because you were addressing this exact area.
>
> > 3 = sum(x) in rewrite system is a problem
>
> Is it? I guess what is meant by this item is the problem of
> the rewriter that it must create subqueries for view
> aggregate columns if they appear in the WHERE clause.
The issue where was that aggregates can't be on the right in some cases.
Tom Lane brought this up.
>
> That entire area is a very problematic one. And for sake it
> must wait for after v6.5. Aggregates and GROUP BY in views
> are unsafe and depend on the later usage of the view.
> Consider the following:
Yes, I understand.
> > Future TODO items
> > -----------------
> > CREATE VIEW ignores DISTINCT
>
> Covered above.
>
OK.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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