SPI_returntuple
Description
SPI_returntuple
makes a copy of
a row in the upper executor context, returning it in the form of
a row type Datum. The returned pointer need
only be converted to Datum via PointerGetDatum
before returning.
Note that this should be used for functions that are declared
to return composite types. It is not used for triggers; use
SPI_copytuple
for returning a
modified row in a trigger.