On Sep28, 2011, at 00:19 , Marti Raudsepp wrote:
> (I'm still not sure what "adt" means)

I always assumed it stood for "abstract data type". Most of the files in this 
directory seem to correspond to an SQL-level data type like intX, varchar, 
tsquery, ..., and contain the I/O functions for that type, plus some supporting 
operations and functions.

Over time, it seems that this directory was also used for SQL-level functions 
not directly related to a single type, like windowfuncs.c and pgstatfuncs.c. 
The fact that ri_triggers.c lives there also might be a relict from times where 
you'd create FK constraint with CREATE CONSTRAINT TRIGGER and specified one of 
the functions from ri_triggers.c as the procedure to execute.

best regards,
Florian Pflug

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