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-leveldata type like intX, varchar, tsquery, ..., and contain the I/O functions for that type, plus some supporting
operationsand functions.
Over time, it seems that this directory was also used for SQL-level functions not directly related to a single type,
likewindowfuncs.c and pgstatfuncs.c. The fact that ri_triggers.c lives there also might be a relict from times where
you'dcreate FK constraint with CREATE CONSTRAINT TRIGGER and specified one of the functions from ri_triggers.c as the
procedureto execute.
best regards,
Florian Pflug