From 257bc353a4844c6d49101839dc6cb3765517dbe1 Mon Sep 17 00:00:00 2001
From: zhouzb <zhouzb@emqx.io>
Date: Wed, 20 Oct 2021 10:14:47 +0800
Subject: [PATCH] fix(authn): fix placeholders are not replaced correctly

---
 apps/emqx_authn/src/simple_authn/emqx_authn_mysql.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apps/emqx_authn/src/simple_authn/emqx_authn_mysql.erl b/apps/emqx_authn/src/simple_authn/emqx_authn_mysql.erl
index b4c6dac08..cd658e6f1 100644
--- a/apps/emqx_authn/src/simple_authn/emqx_authn_mysql.erl
+++ b/apps/emqx_authn/src/simple_authn/emqx_authn_mysql.erl
@@ -144,7 +144,7 @@ destroy(#{'_unique' := Unique}) ->
 parse_query(Query) ->
     case re:run(Query, ?RE_PLACEHOLDER, [global, {capture, all, binary}]) of
         {match, Captured} ->
-            PlaceHolders = [PlaceHolder || PlaceHolder <- Captured],
+            PlaceHolders = [PlaceHolder || [PlaceHolder] <- Captured],
             NQuery = re:replace(Query, "'\\$\\{[a-z0-9\\_]+\\}'", "?", [global, {return, binary}]),
             {NQuery, PlaceHolders};
         nomatch ->