Question: Why sorting the nodes again when the nodes is sorted by the function speficified by the config option 'sort.sorter'

[zjykzk]

why it's still to do do merge sort for prevent memory exceed when the configation of sort.sorter does return nothing

since the nodes in the variable t_users is in the order defined by the user, maybe it's better not to do that?

Best wishes!

[alex-courtis]

sort.sorter will return nothing when the user returns a value like "name", which is a Sorter method.

When they return nothing (they have sorted t_user) the merge sort will still be done.