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Re: Window Functions: v07 APIs and buffering strateties

From: Martijn van Oosterhout <kleptog(at)svana(dot)org>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com>,ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>,PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Window Functions: v07 APIs and buffering strateties
Date: 2008-10-28 17:37:23
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Tue, Oct 28, 2008 at 12:38:09PM -0400, Tom Lane wrote:
> "Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com> writes:
> > In window specifications, we have
> > OVER (ORDER BY expr_list [(ROWS|RANGE) ... ])
> > and currently "ROWS" is not reserved so bison is confused with cases
> > of "ROWS" included in expr_list and in FRAME clause. Because there is
> > no delimiter between ORDER BY clause and FRAME (that is (ROWS |
> > RANGE)) clause, "ROWS" can be in expr_list as a_expr.
> Right offhand, I don't see any alternative but to make both ROWS and
> RANGE reserved.  It's pretty annoying since that might break existing
> applications that have been using these as identifiers, but the SQL
> committee seems to care little about that :-(

Given that the only problematic case is if expr_list ends with a
postfix operator, wouldn't it be sufficient to simply decree that in
that case you need parentheses? Seems a lot less painful than adding
two reserved words.

Have a nice day,
Martijn van Oosterhout   <kleptog(at)svana(dot)org>
> Please line up in a tree and maintain the heap invariant while 
> boarding. Thank you for flying nlogn airlines.

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