From b1a18293629f7b1a9f4e9f5eb36836becff981d3 Mon Sep 17 00:00:00 2001
From: Sergey Dryabzhinsky <sergey.dryabzhinsky+github@gmail.com>
Date: Sat, 26 Dec 2020 12:02:51 +0300
Subject: [PATCH] For #518 - use new schema for mariab-10.2+

And check for one more column existance
---
 mysqltuner.pl | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/mysqltuner.pl b/mysqltuner.pl
index 32e776a..b586072 100644
--- a/mysqltuner.pl
+++ b/mysqltuner.pl
@@ -1769,16 +1769,24 @@ sub security_recommendations {
     }
 
     my $PASS_COLUMN_NAME = 'password';
-    if ( $myvar{'version'} =~ /5\.7|10\..*MariaDB*/ ) {
+    # New table schema available since mysql-5.7 and mariadb-10.2
+    # But need to be checked
+    if ( $myvar{'version'} =~ /5\.7|10\.[2-5]\..*MariaDB*/ ) {
         my $password_column_exists =
 `$mysqlcmd $mysqllogin -Bse "SELECT 1 FROM information_schema.columns WHERE TABLE_SCHEMA = 'mysql' AND TABLE_NAME = 'user' AND COLUMN_NAME = 'password'" 2>>/dev/null`;
-        if ($password_column_exists) {
+        my $authstring_column_exists =
+`$mysqlcmd $mysqllogin -Bse "SELECT 1 FROM information_schema.columns WHERE TABLE_SCHEMA = 'mysql' AND TABLE_NAME = 'user' AND COLUMN_NAME = 'authentication_string'" 2>>/dev/null`;
+        if ($password_column_exists && $authstring_column_exists) {
             $PASS_COLUMN_NAME =
 "IF(plugin='mysql_native_password', authentication_string, password)";
         }
-        else {
+        else if ($authstring_column_exists) {
             $PASS_COLUMN_NAME = 'authentication_string';
         }
+        else if (!$password_column_exists) {
+            infoprint "Skipped due to none of known auth columns exists";
+            return;
+        }
     }
     debugprint "Password column = $PASS_COLUMN_NAME";