fix(paging): respect matchspec even if qs is empty when counting

apps/emqx_authz/test/emqx_authz_api_mnesia_SUITE.erl

@@ -109,14 +109,17 @@ t_api(_) ->
             ]),
             []
         ),
+    ?assertEqual(
         #{
-        <<"data">> := [],
-        <<"meta">> := #{
-            <<"limit">> := 20,
-            <<"page">> := 1,
-            <<"hasnext">> := false
+            <<"data">> => [],
+            <<"meta">> => #{
+                <<"limit">> => 20,
+                <<"page">> => 1,
+                <<"hasnext">> => false
             }
-    } = jsx:decode(Request1_1),
+        },
+        jsx:decode(Request1_1)
+    ),
 
     {ok, 200, Request2} =
         request(
@@ -160,6 +163,14 @@ t_api(_) ->
             []
         ),
 
+    % ensure that db contain a mix of records
+    {ok, 204, _} =
+        request(
+            post,
+            uri(["authorization", "sources", "built_in_database", "username"]),
+            [?USERNAME_RULES_EXAMPLE]
+        ),
+
     {ok, 204, _} =
         request(
             post,

apps/emqx_management/src/emqx_mgmt_api.erl

@@ -384,8 +384,6 @@ apply_total_query(QueryState = #{table := Tab}) ->
             Fun(Tab)
     end.
 
-counting_total_fun(_QueryState = #{qs := {[], []}}) ->
-    fun(Tab) -> ets:info(Tab, size) end;
 counting_total_fun(_QueryState = #{match_spec := Ms, fuzzy_fun := undefined}) ->
     %% XXX: Calculating the total number of data that match a certain
     %% condition under a large table is very expensive because the
@@ -400,7 +398,9 @@ counting_total_fun(_QueryState = #{match_spec := Ms, fuzzy_fun := undefined}) ->
 counting_total_fun(_QueryState = #{fuzzy_fun := FuzzyFun}) when FuzzyFun =/= undefined ->
     %% XXX: Calculating the total number for a fuzzy searching is very very expensive
     %% so it is not supported now
-    false.
+    false;
+counting_total_fun(_QueryState = #{qs := {[], []}}) ->
+    fun(Tab) -> ets:info(Tab, size) end.
 
 %% ResultAcc :: #{count := integer(),
 %%                cursor := integer(),