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Re: Proposed patch for sequence-renaming problems

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Gavin Sherry <swm(at)linuxworld(dot)com(dot)au>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-patches(at)postgresql(dot)org
Subject: Re: Proposed patch for sequence-renaming problems
Date: 2005-09-29 02:51:31
Message-ID: 200509290251.j8T2pV016205@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
Gavin Sherry wrote:
> > So it's really sort of a magic combination of nextval() and currval().
> > To meet the spec semantics, we'd need some sort of layer over nextval()
> > that would keep track of whether a new value should be obtained or not.
> >
> > I don't think we should use the spec syntax until we're prepared to
> > meet the spec semantics, so NEXT VALUE FOR as part of the current patch
> > seems "out".
> 
> Well, AFAICT, the only part of the spec we cannot implement is what you
> quote above. Therefore, why can't we support NEXT VALUE FOR seqname and
> reject table creation/alteration which would add more than one reference
> to the same sequence. That will allow us to avoid an intermediate step
> in getting to the SQL2003 syntax. Having to support three different
> sequence incrementation mechanisms for three flavours of PostgreSQL is
> going to be a real PITA.

Well, that is an _excellent_ point.  We would have three mechanisms,
which is confusing.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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