Function mda_get_prod

src/backend/utils/adt/arrayutils.c:158–166

* Compute products of array dimensions, ie, scale factors for subscripts * * We assume caller has validated dimensions, so overflow is impossible */

 * We assume caller has validated dimensions, so overflow is impossible
 */
void
mda_get_prod(int n, const int *range, int *prod)
{
	int			i;

	prod[n - 1] = 1;
	for (i = n - 2; i >= 0; i--)
		prod[i] = prod[i + 1] * range[i + 1];
}

/*
 * From products of whole-array dimensions and spans of a sub-array,