Dirk Lutzebaeck <lutzeb@aeccom.com> writes:
> I'm defining a new aggregate using a C transition function. It is of
> type TEXT, so the C function gets pointers (*text) to the internal-state1 and
> next-data-item parameters.
> Question is if the returning value of type *text must be palloc'ed or
> can be just taken from the input parameters.
The result must be a fresh palloc, since both inputs will be pfreed the
moment you return. 7.1 will copy the result for you if you are so
incautious as to try to return an input, but 7.0.* just falls over :-(
regards, tom lane