To all,

I am brand new to writing functions for PostgreSQL and understand that this 
question has been asked one hundred and one times.  Please be patient with me, 
I do learn quickly.

My question is:

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.

Thanks in advance.

Aaron  

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