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From: Joe Conway <mail@joeconway.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Christopher Kings-Lynne <chris.kings-lynne@calorieking.com>
Cc: Hackers (PostgreSQL) <pgsql-hackers@postgresql.org>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: Bernd Helmle <mailings@oopsware.de>
Cc: Peter Eisentraut <peter_e@gmx.net>
Cc: Susanne Ebrecht <susanne.ebrecht@credativ.de>
Subject: Re: [PATCHES] 8.2 features?
Date: Thu, 20 Jul 2006 20:09:47 -0700
Message-ID: <44C0457B.1010303@joeconway.com> (raw)
In-Reply-To: <14047.1153442773@sss.pgh.pa.us>
References: <44B69778.5050104@dunslane.net>
	<50461.84.63.113.55.1152832991.squirrel@pezone.net>
	<ECCAAC0A3182895D3D12B0E8@[172.26.14.247]>
	<44B7ADFC.90205@dunslane.net>
	<44BC0432.3040509@joeconway.com>
	<44BC661F.80609@joeconway.com>
	<44BCD06C.3060409@calorieking.com>
	<44BCF1D4.3010807@dunslane.net>
	<5842.1153246741@sss.pgh.pa.us>
	<44BD8854.9060506@calorieking.com>
	<15212.1153279954@sss.pgh.pa.us>
	<44BDB2F5.7080003@joeconway.com>
	<44BEA710.6060700@joeconway.com>
	<23198.1153367887@sss.pgh.pa.us>
	<44BF0382.2010501@joeconway.com>
	<23454.1153370214@sss.pgh.pa.us>
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	<23927.1153373971@sss.pgh.pa.us>
	<44C00E1E.1000405@joeconway.com>
	<14047.1153442773@sss.pgh.pa.us>

Tom Lane wrote:
> No, I guess I confused you by talking about the executor representation
> at the same time.  This is really unrelated to the executor.  The join
> tree I'm thinking of here is the data structure that dangles off
> Query.jointree --- it's a representation of the query's FROM clause,
> and (at present) can contain RangeTblRef, FromExpr, and JoinExpr nodes.
> See the last hundred or so lines of primnodes.h for some details.
> The jointree is used by the planner to compute the plan node tree that
> the executor will run, but it's not the same thing.

Ah, that helps. Thanks for the explanation. I'll start digging in again...

Thanks,

Joe

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