Mdev-12017 Post Fix

Allow setting up binlog_format other then row for session scope for galera/
flashback.

Ref:- Mdev-7322

mysql-test/suite/binlog/r/flashback.result

@@ -503,7 +503,8 @@ a	b
 3	2
 4	3
 SET binlog_format=statement;
-ERROR HY000: Flashback does not support binlog_format STATEMENT
+Warnings:
+Warning        1105    MariaDB Galera and flashback do not support binlog format: STATEMENT
 SET GLOBAL binlog_format=statement;
 ERROR HY000: Flashback does not support binlog_format STATEMENT
 DROP TABLE t1;

mysql-test/suite/binlog/t/flashback.test

@@ -160,7 +160,6 @@ let $MYSQLD_DATADIR= `select @@datadir`;
 
 SELECT * FROM t1;
 
---error ER_FLASHBACK_NOT_SUPPORTED
 SET binlog_format=statement;
 --error ER_FLASHBACK_NOT_SUPPORTED
 SET GLOBAL binlog_format=statement;

mysql-test/suite/wsrep/disabled.def

 foreign_key : MDEV-7915
-binlog_format : MDEV-11532

sql/sys_vars.cc

@@ -456,6 +456,16 @@ static bool binlog_format_check(sys_var *self, THD *thd, set_var *var)
     push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
                         "MariaDB Galera and flashback do not support binlog format: %s",
                         binlog_format_names[var->save_result.ulonglong_value]);
+    /*
+      We allow setting up binlog_format other then ROW for session scope when
+      wsrep/flasback is enabled.This is done because of 2 reasons
+      1. User might want to run pt-table-checksum.
+      2. SuperUser knows what is doing :-)
+
+      For refrence:- MDEV-7322
+    */
+    if (var->type == OPT_GLOBAL)
+    {
       if (WSREP(thd))
         WSREP_ERROR("MariaDB Galera does not support binlog format: %s",
                     binlog_format_names[var->save_result.ulonglong_value]);
@@ -464,6 +474,7 @@ static bool binlog_format_check(sys_var *self, THD *thd, set_var *var)
                  binlog_format_names[var->save_result.ulonglong_value]);
       return true;
     }
+  }
 
   if (var->type == OPT_GLOBAL)
     return false;