Re: C-Function: Returning Rows

Carel Combrink <s25291930(at)tuks(dot)co(dot)za> writes:
> in my function I have the following:
> TupleDesc tup_descriptor;
> Datum dat_values[2];
> HeapTuple heap_tuple;
> bool *pNulls;

> get_call_result_type(fcinfo, NULL, &tup_descriptor);
> BlessTupleDesc(tup_descriptor);
> dat_values[0] = Int32GetDatum(50);
> dat_values[1] = Int32GetDatum(20);
> iTup_Length = tup_descriptor->natts;
> pNulls = palloc(iTup_Length * sizeof(bool));
> heap_tuple = heap_form_tuple(tup_descriptor, dat_values, pNulls);
> PG_RETURN_DATUM(HeapTupleGetDatum(heap_tuple));

> Am I doing something wrong in my function that would have this affect?

Failing to initialize the values of pNulls[], no doubt.

It would also be a good idea to check for a failure result from
get_call_result_type.

BTW, what's the rationale for using a fixed-length Datum array and
a variable-length nulls array? Usually people handle both of those
the same way.

regards, tom lane