I was thinking of hacking on postgres a bit. I want to start with filling out
the operations list for data types that seem to be missing obvious operators.
In particular I'm thinking of things like
. an aggregate function for cidr that would find the smallest enclosing netblock.
. an aggregate function for box, point, etc for the bounding box
I had some other ideas but I don't remember them now.
Anyways, I'm a bit stumped where to start. Looking at the existing operations
there seems to be a bit of magic using macros involved in creating
accumulators and result sets that I don't get.
Is there a walk-through of a typical datatype and how to code an operator
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