From 2be6b2dcc368ff76842b035b67f7a8170d787889 Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Thu, 12 Oct 2017 17:32:52 +0200
Subject: [PATCH] auth: Display the needed size when a MySQL result was
 truncated

---
 modules/gmysqlbackend/smysql.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/gmysqlbackend/smysql.cc b/modules/gmysqlbackend/smysql.cc
index 5e9354254a..aab16daf9d 100644
--- a/modules/gmysqlbackend/smysql.cc
+++ b/modules/gmysqlbackend/smysql.cc
@@ -233,8 +233,8 @@ public:
     row.reserve(d_fnum);
 
     for(int i=0;i<d_fnum;i++) {
-      if (*d_res_bind[i].error) {
-        L<<Logger::Warning<<"Result field at row " << d_residx << " column " << i << " has errno " << *d_res_bind[i].error << endl;
+      if (err == MYSQL_DATA_TRUNCATED && *d_res_bind[i].error) {
+        L<<Logger::Warning<<"Result field at row " << d_residx << " column " << i << " has been truncated, we allocated " << d_res_bind[i].buffer_length << " bytes but at least " << *d_res_bind[i].length << " was needed" << endl;
       }
       if (*d_res_bind[i].is_null) {
         row.push_back("");
-- 
2.47.2