memmove_leaf_items
memmove_leaf_items(right, push_items, 0, right_nritems);
memmove_leaf_items(right, 0, push_items,
memmove_leaf_items(leaf, slot + 1, slot, nritems - slot);
memmove_leaf_items(leaf, slot + batch->nr, slot, nritems - slot);
memmove_leaf_items(leaf, slot, slot + nr, nritems - slot - nr);