Function array_agg_finalfn

src/backend/utils/adt/array_userfuncs.c:523–553

}

Datum
array_agg_finalfn(PG_FUNCTION_ARGS)
{
	Datum		result;
	ArrayBuildState *state;
	int			dims[1];
	int			lbs[1];

	/* cannot be called directly because of internal-type argument */
	Assert(AggCheckCallContext(fcinfo, NULL));

	state = PG_ARGISNULL(0) ? NULL : (ArrayBuildState *) PG_GETARG_POINTER(0);

	if (state == NULL)
		PG_RETURN_NULL();		/* returns null iff no input values */

	dims[0] = state->nelems;
	lbs[0] = 1;

	/*
	 * Make the result.  We cannot release the ArrayBuildState because
	 * sometimes aggregate final functions are re-executed.  Rather, it is
	 * nodeAgg.c's responsibility to reset the aggcontext when it's safe to do
	 * so.
	 */
	result = makeMdArrayResult(state, 1, dims, lbs,
							   CurrentMemoryContext,
							   false);

	PG_RETURN_DATUM(result);
}

Datum
array_agg_combine(PG_FUNCTION_ARGS)