diff --git a/sql/sql_update.cc b/sql/sql_update.cc
index cc6332c8d8d0c1f59ef02d353a91630141965f9e..963cfced66084d9becd8c425f3d7f22c08ecba36 100644
--- a/sql/sql_update.cc
+++ b/sql/sql_update.cc
@@ -552,6 +552,8 @@ bool Sql_cmd_update::update_single_table(THD *thd) {
 
   const bool using_filesort = order && need_sort;
 
+  DBUG_EXECUTE_IF("mark_third_bit_in_read_set",
+                  bitmap_set_bit(table->read_set, 2););
   table->mark_columns_per_binlog_row_image(thd);
 
   if (prepare_partial_update(trace, select_lex->fields, *update_value_list))
diff --git a/mysql-test/t/isolation_level.test b/mysql-test/t/isolation_level.test
new file mode 100644
index 0000000000000000000000000000000000000000..30dab189bae331b853a62f6b5d31384d02a93f4f
--- /dev/null
+++ b/mysql-test/t/isolation_level.test
@@ -0,0 +1,118 @@
+--connect(c0, 127.0.0.1,root,,test,$MASTER_MYPORT,)
+--connection c0
+SELECT @@log_bin, @@version, @@binlog_format;
+
+--echo
+--let $value = `SELECT @@log_bin`
+--let $assert_text = Binlog enabled
+--let $assert_cond = "$value" = "0"
+--source include/assert.inc
+
+CREATE TABLE `t1` (
+    `id` int(11) PRIMARY KEY,
+    `type` int DEFAULT NULL,
+    `name` varchar(20) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+
+--connect(c1, 127.0.0.1,root,,test,$MASTER_MYPORT,)
+--connect(c2, 127.0.0.1,root,,test,$MASTER_MYPORT,)
+
+--echo
+--echo 1) UPDATING THE SAME RECORD WITH THE SAME VALUE AND UPDATE COLUMN BIT SET
+--echo -------------------------------------------------------------------------
+
+INSERT INTO t1 VALUES (1,100,'abc');
+
+--connection c1
+--echo [connection c1]
+BEGIN;
+SELECT * FROM t1;
+
+--connection c2
+--echo [connection c2]
+BEGIN;
+SELECT * FROM t1;
+
+--connection c1
+--echo [connection c1]
+UPDATE t1 SET name = 'xyz' WHERE id = 1;
+SELECT ROW_COUNT();
+SELECT * FROM t1;
+COMMIT;
+
+--connection c2
+--echo [connection c2]
+
+--echo
+--let $value = `SELECT name FROM t1 WHERE id = 1 AND name = 'abc' AND type = 100`
+--let $assert_text = SEEING OLD VALUE
+--let $assert_cond = "$value" = "abc"
+--source include/assert.inc
+--echo
+
+SET SESSION debug='+d,mark_third_bit_in_read_set';
+UPDATE t1 SET name = 'xyz' WHERE id = 1;
+SELECT ROW_COUNT();
+SELECT * FROM t1;
+--echo
+--let $value = `SELECT name FROM t1 WHERE id = 1`
+--let $assert_text = SEEING OLD VALUE
+--let $assert_cond = "$value" = "abc"
+--source include/assert.inc
+--echo
+COMMIT;
+
+SELECT * FROM t1;
+SET SESSION debug='-d,mark_third_bit_in_read_set';
+
+--echo
+--echo 2) UPDATING THE SAME RECORD WITH OTHER VALUE AND UPDATE COLUMN BIT SET
+--echo ----------------------------------------------------------------------
+
+TRUNCATE t1;
+INSERT INTO t1 VALUES (1,100,'abc');
+
+--connection c1
+--echo [connection c1]
+BEGIN;
+SELECT * FROM t1;
+
+--connection c2
+--echo [connection c2]
+BEGIN;
+SELECT * FROM t1;
+
+--connection c1
+--echo [connection c1]
+UPDATE t1 SET name = 'xyz' WHERE id = 1;
+SELECT ROW_COUNT();
+SELECT * FROM t1;
+COMMIT;
+
+--connection c2
+--echo [connection c2]
+
+--echo
+--let $value = `SELECT name FROM t1 WHERE id = 1 AND name = 'abc' AND type = 100`
+--let $assert_text = SEEING OLD VALUE
+--let $assert_cond = "$value" = "abc"
+--source include/assert.inc
+--echo
+
+SET SESSION debug='+d,mark_third_bit_in_read_set';
+UPDATE t1 SET name = 'pqr' WHERE id = 1;
+SELECT ROW_COUNT();
+SELECT * FROM t1;
+--echo
+--let $value = `SELECT name FROM t1 WHERE id = 1`
+--let $assert_text = SEEING NEW VALUE
+--let $assert_cond = "$value" = "pqr"
+--source include/assert.inc
+--echo
+COMMIT;
+
+SELECT * FROM t1;
+SET SESSION debug='-d,mark_third_bit_in_read_set';
+
+--disconnect c1
+--disconnect c2