Re: TupleDesc and HeapTuple

2010/7/7 Luca Ferrari <fluca1978(at)infinito(dot)it>:
> On Tuesday, July 06, 2010 09:58:45 pm Alvaro Herrera's cat walking on the
> keyboard wrote:
>> You're supposed to know which relation you got the HeapTuple from, so
>> you get the TupleDesc from there.
>
> True, but if I want to pass the heaptuple around I must pass also its tuple
> desc, or the receiver will not know how the tuple is composed. Maybe this case
> never happens/happened.
>

In pg core - receiver have to have actual datatype everywhere - so if
you write a some general function, then you put a Datum value -
universal PostgreSQL datatype and you have to put a datatype
identification - Oid, typmod or TupleDesc.

Pavel

> Luca
>
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