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Re: [HACKERS] Upgrades for 6.4.1

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: tgl(at)sss(dot)pgh(dot)pa(dot)us (Tom Lane)
Cc: lockhart(at)alumni(dot)caltech(dot)edu, hackers(at)postgreSQL(dot)org
Subject: Re: [HACKERS] Upgrades for 6.4.1
Date: 1998-12-19 23:37:59
Message-ID: (view raw or whole thread)
Lists: pgsql-hackers
> "Thomas G. Lockhart" <lockhart(at)alumni(dot)caltech(dot)edu> writes:
> >> * SELECT DISTINCT i FROM dtest ORDER BY j generates strange output
> > In my simple test case, it orders by j, then only shows i. Is that
> > strange?
> The thing that is "strange" is that you get nonunique values of i,
> which is definitely a bit unexpected for "SELECT DISTINCT":
> I don't know whether the SQL standard defines how this combination of
> features ought to work ... but our current behavior seems fairly
> surprising...

Re-added to TODO list.

> >> * Allow constraint NULL just as we honor NOT NULL
> > Fundamental yacc problem with this as I recall. Gives rise to
> > shift/reduce problems since it is ambiguous with other uses of "NULL" in
> > the same area.
> More to the point, what possible use would a column constrained to NULL
> be?  Might as well just not have it in the table...

It just says the column _may_ accept nulls.  It is the default anyway.

  Bruce Momjian                        |
  maillist(at)candle(dot)pha(dot)pa(dot)us            |  (610) 853-3000
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