Aaron Spiteri <azzmosphere@hotmail.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
