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DSGN: Allow functional definitions of custom nodes #1639
In #1637, the idea of being able to define your own nodes using decorators came up.
For example (and I'm speculating here),
@postgres.udf([dt.double, dt.double], dt.double) def my_node(x, y, **kwargs): return # things in the "space" of the backend, in this case, it would be SQLAlchemy code
We should think through what this would look like and discuss any relevant details.