nickva commented on code in PR #5858:
URL: https://github.com/apache/couchdb/pull/5858#discussion_r3615502801


##########
src/mango/src/mango_native_proc.erl:
##########
@@ -95,6 +100,17 @@ handle_call({prompt, [<<"nouveau_index_doc">>, Doc]}, 
_From, St) ->
                 Else
         end,
     {reply, Vals, St};
+handle_call({prompt, [<<"validate_fun">>, Selector0 | _Rest]}, _From, St) ->
+    try mango_selector:normalize(Selector0) of
+        Selector ->
+            case validate_vdu(Selector) of
+                ok -> {reply, true, St};
+                Error -> {reply, {error, Error}, St}
+            end
+    catch
+        throw:{mango_error, mango_selector, Error} ->

Review Comment:
   I was thinking instead more specific we could make it more general so we'd 
match on `_` for module `throw:{mango_error, _, Error}` now we'd catch errors 
from mango_util, selector and all the future modules



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