SPI_returntuple — prepare to return a tuple as a Datum
SPI_returntuple makes a copy of a
row in the upper executor context, returning it in the form of a
Datum. The returned pointer need
only be converted to
PointerGetDatum before returning.
This function can only be used while connected to SPI.
Otherwise, it returns NULL and sets
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.
row to be copied
descriptor for row (pass the same descriptor each time for most effective caching)
HeapTupleHeader pointing to copied
NULL on error (see
SPI_result for an error indication)
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