Function BuildTupleFromCStrings

src/backend/executor/execTuples.c:2151–2203

* BuildTupleFromCStrings - build a HeapTuple given user data in C string form. * values is an array of C strings, one for each attribute of the return tuple. * A NULL string pointer indicates we want to create a NULL field. */

 * A NULL string pointer indicates we want to create a NULL field.
 */
HeapTuple
BuildTupleFromCStrings(AttInMetadata *attinmeta, char **values)
{
	TupleDesc	tupdesc = attinmeta->tupdesc;
	int			natts = tupdesc->natts;
	Datum	   *dvalues;
	bool	   *nulls;
	int			i;
	HeapTuple	tuple;

	dvalues = (Datum *) palloc(natts * sizeof(Datum));
	nulls = (bool *) palloc(natts * sizeof(bool));

	/*
	 * Call the "in" function for each non-dropped attribute, even for nulls,
	 * to support domains.
	 */
	for (i = 0; i < natts; i++)
	{
		if (!TupleDescAttr(tupdesc, i)->attisdropped)
		{
			/* Non-dropped attributes */
			dvalues[i] = InputFunctionCall(&attinmeta->attinfuncs[i],
										   values[i],
										   attinmeta->attioparams[i],
										   attinmeta->atttypmods[i]);
			if (values[i] != NULL)
				nulls[i] = false;
			else
				nulls[i] = true;
		}
		else
		{
			/* Handle dropped attributes by setting to NULL */
			dvalues[i] = (Datum) 0;
			nulls[i] = true;
		}
	}

	/*
	 * Form a tuple
	 */
	tuple = heap_form_tuple(tupdesc, dvalues, nulls);

	/*
	 * Release locally palloc'd space.  XXX would probably be good to pfree
	 * values of pass-by-reference datums, as well.
	 */
	pfree(dvalues);
	pfree(nulls);

	return tuple;
}

/*
 * HeapTupleHeaderGetDatum - convert a HeapTupleHeader pointer to a Datum.