From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Aaron Spiteri <azzmosphere(at)hotmail(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Silly Newbie question |
Date: | 2008-02-29 04:07:36 |
Message-ID: | 21552.1204258056@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Aaron Spiteri <azzmosphere(at)hotmail(dot)com> writes:
> I wish to create a an aggregate function and have read and re-read the
> 34.10 section of the 8.3 documentation as well as scanned through the
> fmgr header file. My problem is that I know certain structures are
> created with the idea of retaining information for use in the state
> function but I don't really understand which structures I should be
> looking at and how to initilize them (if needed) in the sfunc. Any
> pushes in the right direction would be very appreciated, I am using
> the Version 1 calling convention.
Are there any existing aggregates that do something similar to what you
need? If so, try taking a look at their source code. The general rule
in writing C code for Postgres is that it's an open-book test ;-) ---
you are expected to look at the code, not only the documentation.
regards, tom lane
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