| From: | Ehab Galal <ehabgalal123(at)hotmail(dot)com> |
|---|---|
| To: | "pgsql-sql(at)postgresql(dot)org" <pgsql-sql(at)postgresql(dot)org> |
| Subject: | marking tuples |
| Date: | 2007-12-04 22:25:09 |
| Message-ID: | BAY138-W31C72CF9118BE1CB6BC00966D0@phx.gbl |
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| Thread: | |
| Lists: | pgsql-sql |
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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