diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine.erl b/apps/emqx_rule_engine/src/emqx_rule_engine.erl
index 006fa4ff9..1e27b68ce 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine.erl
@@ -62,6 +62,12 @@ delete_rule(RuleId) ->
 %%------------------------------------------------------------------------------
 %% Internal Functions
 %%------------------------------------------------------------------------------
+
+%% The pattern {'ok', Select} can never match the type {'error',{_,[{_,_,_,_}]}}.
+%% probably due to stack depth, or inlines.
+-dialyzer({nowarn_function, [do_create_rule/1, parse_outputs/1, do_parse_outputs/1,
+    pre_process_repub_args/1, preproc_vars/1]}).
+
 do_create_rule(Params = #{id := RuleId, sql := Sql, outputs := Outputs}) ->
     case emqx_rule_sqlparser:parse(Sql) of
         {ok, Select} ->
diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl b/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
index 375215bc7..c9112b7c3 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
@@ -237,6 +237,10 @@ param_path_id() ->
 %% Rules API
 %%------------------------------------------------------------------------------
 
+%% The pattern {'ok', Rule} can never match the type {'error',{_,'invalid_string' | binary() | [tuple()] | {_,[any()]} | {_,'sql_lex',{_,_}}}}
+%% probably due to stack depth, or inlines.
+-dialyzer({nowarn_function, [crud_rules/2, crud_rules_by_id/2]}).
+
 list_events(#{}, _Params) ->
     {200, emqx_rule_events:event_info()}.
 
@@ -283,10 +287,7 @@ crud_rules_by_id(put, #{bindings := #{id := Id}, body := Params0}) ->
 crud_rules_by_id(delete, #{bindings := #{id := Id}}) ->
     case emqx_rule_engine:delete_rule(Id) of
         ok -> {200};
-        {error, not_found} -> {200};
-        {error, Reason} ->
-            ?LOG(error, "delete rule failed: ~0p", [Reason]),
-            {500, #{code => 'UNKNOW_ERROR', message => err_msg(Reason)}}
+        {error, not_found} -> {200}
     end.
 
 %%------------------------------------------------------------------------------
diff --git a/apps/emqx_rule_engine/src/emqx_rule_sqlparser.erl b/apps/emqx_rule_engine/src/emqx_rule_sqlparser.erl
index 71ae058ca..b7833234b 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_sqlparser.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_sqlparser.erl
@@ -74,7 +74,7 @@ parse(Sql) ->
                         from = get_value(from, Clauses),
                         where = get_value(where, Clauses)
                     }};
-            {error, Error} -> {error, Error}
+            Error -> {error, Error}
         end
     catch
         _Error:Reason:StackTrace ->