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Re: Window Functions: v07 APIs and buffering strateties

From: ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>
To: "Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com>
Cc: "PostgreSQL Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Window Functions: v07 APIs and buffering strateties
Date: 2008-10-28 04:20:49
Message-ID: 20081028130511.DC4F.52131E4D@oss.ntt.co.jp (view raw or flat)
Thread:
Lists: pgsql-hackers
"Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com> wrote:

> As I promised, version 7 of the window functions is now released.
> patch: http://umitanuki.net/pgsql/window_functions.patch.20081028.gz

I tested the patch on mingw (Windows) and
got the following warning and error:

  A. gram.y: conflicts: 3 shift/reduce
  B. include/nodes/plannodes.h:650: error: syntax error before "uint"

I have no idea about A.

B is reported on the type 'uint' in struct Window.
I can compile the code if I replace 'uint' to 'uint32' 

typedef struct Window
{
...
	uint		preceding_rows;	/* used only when FRAME_ROWS */
	uint		following_rows;	/* used only when FRAME_ROWS */

> SELECT sum(i) OVER (ORDER BY i) FROM generate_series(1, 10) i;

works fine, but...

> select relid,AVG(seq_Scan) OVER (ORDER BY relid)
> FROM pg_stat_user_tables
> GROUP BY relid,seq_scan;

crashes with segfault.

=# SELECT version();
                                               version
------------------------------------------------------------------------------------------------------
 PostgreSQL 8.4devel on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.5 (mingw-vista special r3)
(1 row)

Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center



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