Re: wip: functions median and percentile

Pavel Stehule <pavel.stehule@gmail.com>

From: Pavel Stehule <pavel.stehule@gmail.com>

To: Peter Eisentraut <peter_e@gmx.net>

Cc: Greg Stark <gsstark@mit.edu>, Tom Lane <tgl@sss.pgh.pa.us>, Dean Rasheed <dean.a.rasheed@gmail.com>, Hitoshi Harada <umi.tanuki@gmail.com>, Robert Haas <robertmhaas@gmail.com>, David Fetter <david@fetter.org>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>

Date: 2010-10-13T10:51:51Z

Lists: pgsql-hackers

2010/10/13 Peter Eisentraut <peter_e@gmx.net>:
> On mån, 2010-10-11 at 20:46 +0200, Pavel Stehule wrote:
>> The problem is in interface. The original patch did it, but I removed
>> it. We cannot to unsure immutability of some parameters now.
>
> How about you store the "immutable" parameter in the transition state
> and error out if it changes between calls?
>

yes, it's possibility. Now I looking there and I see the as more
important problem the conformance with ANSI SQL. see my last post.
There can be a kind of aggregate functions based on tuplesort.

Regards

Pavel

>