Tom Lane wrote:

Is it really necessary to hack up the grammar for this?  Seems like
you should create ordinary functions to manipulate the datatype(s).
If every datatype thought it could do this sort of thing, we'd have
a completely unmanageable grammar.

Can we do variadic functions without hacking the grammar? My impression was that we could not. Maybe we need a generic mechanism for that?

Peter said here (more or less uncontradicted) that hacking the grammar would be required for these functions:



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