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From: Ehab Galal <ehabgalal123@hotmail.com>
To: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: marking tuples
Date: Tue, 4 Dec 2007 17:25:09 -0500
Message-ID: <BAY138-W31C72CF9118BE1CB6BC00966D0@phx.gbl> (raw)

Hi,
I am implementing a new algorithm inside postgresql for a side research project. I am just wondering if anyone may give me few hints about the following problem:

Consider the following plan:

NewAggregate
    ->NewJoin
          ->NewJoin
                ->NewJoin
                       ->SeqScan

                       ->SeqScan
                ->SeqScan
          ->SeqScan


In my algorithm, 
each NewJoin node may "mark" its ps_ResultTupleSlot with either red/green. I need that mark to flow in the pipeline so that i can collect them at the top aggregate.

Any hints about how to keep such mark is greatly appreciated.

Thanks a lot,
Ehab

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