chore(util): drop obsolete stuff from `emqx_utils_maps`

apps/emqx_utils/src/emqx_utils_maps.erl

@@ -31,7 +31,6 @@
     binary_string/1,
     deep_convert/3,
     diff_maps/2,
-    merge_with/3,
     best_effort_recursive_sum/3,
     if_only_to_toggle_enable/2
 ]).
@@ -231,55 +230,6 @@ convert_keys_to_atom(BinKeyMap, Conv) ->
         []
     ).
 
-%% copy from maps.erl OTP24.0
-merge_with(Combiner, Map1, Map2) when
-    is_map(Map1),
-    is_map(Map2),
-    is_function(Combiner, 3)
-->
-    case map_size(Map1) > map_size(Map2) of
-        true ->
-            Iterator = maps:iterator(Map2),
-            merge_with_t(
-                maps:next(Iterator),
-                Map1,
-                Map2,
-                Combiner
-            );
-        false ->
-            Iterator = maps:iterator(Map1),
-            merge_with_t(
-                maps:next(Iterator),
-                Map2,
-                Map1,
-                fun(K, V1, V2) -> Combiner(K, V2, V1) end
-            )
-    end;
-merge_with(Combiner, Map1, Map2) ->
-    ErrorType = error_type_merge_intersect(Map1, Map2, Combiner),
-    throw(#{maps_merge_error => ErrorType, args => [Map1, Map2]}).
-
-merge_with_t({K, V2, Iterator}, Map1, Map2, Combiner) ->
-    case Map1 of
-        #{K := V1} ->
-            NewMap1 = Map1#{K := Combiner(K, V1, V2)},
-            merge_with_t(maps:next(Iterator), NewMap1, Map2, Combiner);
-        #{} ->
-            merge_with_t(maps:next(Iterator), maps:put(K, V2, Map1), Map2, Combiner)
-    end;
-merge_with_t(none, Result, _, _) ->
-    Result.
-
-error_type_merge_intersect(M1, M2, Combiner) when is_function(Combiner, 3) ->
-    error_type_two_maps(M1, M2);
-error_type_merge_intersect(_M1, _M2, _Combiner) ->
-    badarg_combiner_function.
-
-error_type_two_maps(M1, M2) when is_map(M1) ->
-    {badmap, M2};
-error_type_two_maps(M1, _M2) ->
-    {badmap, M1}.
-
 %% @doc Sum-merge map values.
 %% For bad merges, ErrorLogger is called to log the key, and value in M2 is ignored.
 best_effort_recursive_sum(M10, M20, ErrorLogger) ->
@@ -314,7 +264,7 @@ do_best_effort_recursive_sum(M1, M2, ErrorLogger) ->
                     V1 + V2
             end
         end,
-    merge_with(F, M1, M2).
+    maps:merge_with(F, M1, M2).
 
 deep_filter(M, F) when is_map(M) ->
     %% maps:filtermap is not available before OTP 24