I have been working on a project (for GSOC) to retrieve
planner/optimizer details. As part of the project, I need machine
parsable output. So, I thought I would dust off a patch I found from
last year that Germán Caamaño submitted. I didn't see any further
activity there so I integrated it
For debugging the planner work I'm about to do, I'm expecting it will be
useful to be able to get EXPLAIN to print the targetlist of each plan
node, not just the quals (conditions) as it's historically done. My
first instinct is just to stick in the code under a debugging #ifdef,
but I wonder if
Tom Lane [EMAIL PROTECTED] writes:
For debugging the planner work I'm about to do, I'm expecting it will be
useful to be able to get EXPLAIN to print the targetlist of each plan
node, not just the quals (conditions) as it's historically done. My
first instinct is just to stick in the code
Gregory Stark [EMAIL PROTECTED] writes:
EXPLAIN VERBOSE is indeed ridiculous.
There are other ways to get that printout, too, if you really do need
it.
IMHO You could also move width to VERBOSE while you're at it. In fact you'll
probably want width in precisely the same cases where you want
Tom Lane [EMAIL PROTECTED] writes:
I'm not convinced. The width is often useful to understand why the
planner did something (eg, chose a hash plan or not). The exact
contents of the targetlist are usually not nearly as interesting.
I've never seen a single post on any of the lists where
Gregory Stark [EMAIL PROTECTED] writes:
Or is it estimating the width based on the belief that only the thousand
column is actually going to be emitted?
Right. The width is used to estimate how much space would be needed
for, eg, sorting or hashing the plan node's output. In any case where
On Thu, 2008-04-17 at 12:34 -0400, Tom Lane wrote:
I'm tempted to propose redefining the currently-nearly-useless
EXPLAIN VERBOSE option as doing this.
Yes please.
Sounds like a good home for other useful things also.
I'd like to have an EXPLAIN mode that displayed the plan without *any*
On Thu, 17 Apr 2008, Tom Lane wrote:
For debugging the planner work I'm about to do, I'm expecting it will be
useful to be able to get EXPLAIN to print the targetlist of each plan
node, not just the quals (conditions) as it's historically done.
I've heard that some of the academic users of
On Thu, 17 Apr 2008 20:42:49 +0200, Simon Riggs [EMAIL PROTECTED]
wrote:
On Thu, 2008-04-17 at 12:34 -0400, Tom Lane wrote:
I'm tempted to propose redefining the currently-nearly-useless
EXPLAIN VERBOSE option as doing this.
Yes please.
Sounds like a good home for other useful things
PFC wrote:
Plan = Tree
Tree = XML
If you want to propose a DTD I'm sure there would be many people
interested.
--
Alvaro Herrerahttp://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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