Labels and Declarations (Using the GNU Compiler Collection (GCC))
gcc.gnu.org
From: jian he
Sent: Wednesday, September 6, 2023 14:00
To: Jian Guo
Cc: Tomas Vondra ; Hans Buschmann
; pgsql-hackers@lists.postgresql.org
Subject: Re: Wrong rows estimations with joins o
Sure, Tomas.
Here is the PG Commitfest link: https://commitfest.postgresql.org/44/4510/
From: Tomas Vondra
Sent: Monday, August 21, 2023 18:56
To: Jian Guo ; Hans Buschmann ;
pgsql-hackers@lists.postgresql.org
Cc: Zhenghua Lyu
Subject: Re: Wrong rows
, which avoided the bad assumption,
so the results could be much more accurate.
Regards,
Jian
From: Tomas Vondra
Sent: Monday, August 14, 2023 20:58
To: Jian Guo ; Hans Buschmann ;
pgsql-hackers@lists.postgresql.org
Subject: Re: Wrong rows estimations with joins
Filter: ((ibitmask < 0) OR (cardinality(mat_arr) > 11))
Rows Removed by Filter: 10275
Planning Time: 1.746 ms
Execution Time: 13405.503 ms
(116 Zeilen)
This case really brought me to detect the problem!
The original query and data are not shown here, but the princip
mjgt2yP59t7xtv1mZvC%2BBhtKrfp%2FBY%3D=0<http://www.timbira.com.br/>
PostgreSQL: Consultoria, Desenvolvimento, Suporte 24x7 e Treinamento
!! External Email: This email originated from outside of the organization. Do
not click links or open attachments unless you recognize the sende
Hi hackers,
I have a question about `use_physical_tlist()` which is applied in
`create_scan_plan()`:
```
if (flags == CP_IGNORE_TLIST)
{
tlist = NULL;
}
else if (use_physical_tlist(root, best_path, flags))
{
if (best_path->pathtype == T_IndexOnlyScan)
{
/* For index-only scan, the
review, thanks.
From: Julien Rouhaud
Sent: Friday, March 25, 2022 17:04
To: Jian Guo
Cc: pgsql-hackers@lists.postgresql.org ;
Zhenghua Lyu
Subject: Re: Summary Sort workers Stats in EXPLAIN ANALYZE
⚠ External Email
Hi,
On Thu, Mar 24, 2022 at 07:50:11AM +
"Actual Rows": N, +
"Actual Loops": N, +
"Sort Key": ["unique1"], +
"Workers planned": N, +
"Sort Method": "external merge",
There is some problem with the last patch, I have removed the
`ExplainOpenWorker` call to fix.
And also, I have added a test case in explain.sql according to the code change.
From: Jian Guo
Sent: Monday, March 21, 2022 11:36
To: pgsql-hackers
#L2890
From 8970f3d0f4a4535457dbe7f625081e592ebc1901 Mon Sep 17 00:00:00 2001
From: Jian Guo
Date: Mon, 21 Mar 2022 11:19:46 +0800
Subject: [PATCH] Summary Sort workers Stats.
Signed-off-by: Jian Guo
---
src/backend/commands/explain.c | 48 +++---
1 file changed, 27
@@ -250,14 +302,18 @@ FindStreamingStart(uint32 *tli)
/*
* Check that the segment has the right size, if it's supposed
to be
* completed. For non-compressed segments just check the
on-disk size
-* and see if it matches a
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