Needed for "#017957: (tc-496 and 497) (ezflow and webin) gallery object is not working as should".

Basically we need to figure out at what position current node is, so we need to fetch all nodes and loop over to find position of our node to know next/previous node. But to avoid consuming to much memory we only want node_id column.

This can be used for other things, hence why it should be implemented generally on the fetch function.