Function array_iter_setup

src/include/utils/arrayaccess.h:48–78

static inline void
array_iter_setup(array_iter *it, AnyArrayType *a)
{
	if (VARATT_IS_EXPANDED_HEADER(a))
	{
		if (a->xpn.dvalues)
		{
			it->datumptr = a->xpn.dvalues;
			it->isnullptr = a->xpn.dnulls;
			/* we must fill all fields to prevent compiler warnings */
			it->dataptr = NULL;
			it->bitmapptr = NULL;
		}
		else
		{
			/* Work with flat array embedded in the expanded datum */
			it->datumptr = NULL;
			it->isnullptr = NULL;
			it->dataptr = ARR_DATA_PTR(a->xpn.fvalue);
			it->bitmapptr = ARR_NULLBITMAP(a->xpn.fvalue);
		}
	}
	else
	{
		it->datumptr = NULL;
		it->isnullptr = NULL;
		it->dataptr = ARR_DATA_PTR((ArrayType *) a);
		it->bitmapptr = ARR_NULLBITMAP((ArrayType *) a);
	}
	it->bitmask = 1;
}

static inline Datum
array_iter_next(array_iter *it, bool *isnull, int i,