Martijn van Oosterhout <> writes:
> On Sat, Jul 01, 2006 at 10:37:59AM -0400, Tom Lane wrote:
>> The output function, however, would be quite a trick.
>> It's not going to receive anything except the Datum itself.

> Hmm, you're right. With the taggedtypes module I made it work by
> cloning the output function with a new OID each time and setting the
> arg type so that procLookupArgType() would work. Similarly, the input
> function would use procLookupRettype() to find the desired type.

Oh, I see, you relied on flinfo->fn_oid and then did two cat lookups.
That would work as long as nothing tried to call the function with
DirectFunctionCall ... which is a pretty safe assumption I guess.

                        regards, tom lane

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