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How to form a self-defined TupleTableSlot

From: <Chaoyong(dot)Wang(at)emc(dot)com>
To: <pgsql-hackers(at)postgresql(dot)org>
Subject: How to form a self-defined TupleTableSlot
Date: 2012-07-27 03:39:13
Message-ID: 95FA8B25DB5E2D4E889EB9BEB6A6406F16D7E5@CORPUSMX30B.corp.emc.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Hi, guys.

 

Here is my task situation:

I have a TupleTableSlot, with its own TupleDesc. Now I want to extract
several attributes to form a new TupleTableSlot, how can I define my own
TupleDesc and the ProjectionInfo?

 

Best.

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