Revert "Experiment with temporary us eof ETS table"

This reverts commit 2a106d0dc5.

src/leveled_pmem.erl

@@ -102,16 +102,14 @@ check_index(Hash, L0Index) ->
 
 to_list(Slots, FetchFun) ->
     SW = os:timestamp(),
-    Tab = ets:new(temp_l0, [private, ordered_set]),
-    SlotList = lists:seq(1, Slots),
-    lists:foreach(fun(Slot) ->
-                        Tree = FetchFun(Slot),
-                        L = leveled_skiplist:to_list(Tree),
-                        ets:insert(Tab, L)
-                        end,
-                    SlotList),
-    FullList = ets:tab2list(Tab),
-    true = ets:delete(Tab),
+    SlotList = lists:reverse(lists:seq(1, Slots)),
+    FullList = lists:foldl(fun(Slot, Acc) ->
+                                Tree = FetchFun(Slot),
+                                L = leveled_skiplist:to_list(Tree),
+                                lists:ukeymerge(1, Acc, L)
+                                end,
+                            [],
+                            SlotList),
     leveled_log:log_timer("PM002", [length(FullList)], SW),
     FullList.