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Re: WIP patch for basic window frame support

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com>
Cc: "David Rowley" <dgrowley(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: WIP patch for basic window frame support
Date: 2009-01-05 00:34:53
Message-ID: 1972.1231115693@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
"Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com> writes:
> 2008/12/31 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>> RANGE UNBOUNDED PRECEDING       -- same as AND CURRENT ROW
>> ROWS UNBOUNDED PRECEDING        -- same as AND CURRENT ROW

> Is this true?

7.11 syntax rule 9 says so.  AFAICS general rule 5b doesn't discuss the
case where <window frame bound 2> isn't present, and doesn't need to
because of syntax rule 9.

			regards, tom lane

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