From d5d0890c309266b9f99cd0a6f7cb01a367052112 Mon Sep 17 00:00:00 2001
From: skodak <skodak>
Date: Sat, 25 Oct 2008 18:40:35 +0000
Subject: [PATCH] MDL-14679 dml/native_mysqli fixed sql concat

---
 lib/dml/mysqli_native_moodle_database.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/dml/mysqli_native_moodle_database.php b/lib/dml/mysqli_native_moodle_database.php
index 1acb4b6bfa..b21f95c823 100644
--- a/lib/dml/mysqli_native_moodle_database.php
+++ b/lib/dml/mysqli_native_moodle_database.php
@@ -853,7 +853,7 @@ class mysqli_native_moodle_database extends moodle_database {
         $arr = func_get_args();
         $s = implode(',', $arr);
         if ($s === '') {
-            //TODO: error
+            return "''";
         }
         return "CONCAT($s)";
     }
@@ -864,7 +864,7 @@ class mysqli_native_moodle_database extends moodle_database {
         }
         $s = implode(',', $elements);
         if ($s === '') {
-            //TODO: error
+            return "''";
         }
         return "CONCAT ($s)";
     }
-- 
2.39.5