Fix for Bug #6794 Wrong outcome of update operation of ndb table

mysql-test/r/ndb_update.result

+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (
+pk1 INT NOT NULL PRIMARY KEY,
+b INT NOT NULL,
+c INT NOT NULL
+) ENGINE=ndbcluster;
+INSERT INTO t1 VALUES (0, 0, 0),(1,1,1);
+UPDATE t1 set b = c;
+select * from t1 order by pk1;
+pk1	b	c
+0	0	0
+1	1	1

mysql-test/t/ndb_update.test

+-- source include/have_ndb.inc
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+#
+# Basic test of INSERT in NDB 
+#
+
+#
+# Create a normal table with primary key
+#
+CREATE TABLE t1 (
+  pk1 INT NOT NULL PRIMARY KEY,
+  b INT NOT NULL,
+  c INT NOT NULL
+) ENGINE=ndbcluster;
+
+INSERT INTO t1 VALUES (0, 0, 0),(1,1,1);
+UPDATE t1 set b = c;
+select * from t1 order by pk1;

sql/sql_update.cc

@@ -110,7 +110,8 @@ int mysql_update(THD *thd,
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
   table->grant.want_privilege=want_privilege;
 #endif
-  if (setup_fields(thd, 0, update_table_list, fields, 1, 0, 0))
+  if (setup_fields(thd, 0, update_table_list, fields, 1, 0, 0) ||
+      setup_fields(thd, 0, update_table_list, values, 1, 0, 0))
     DBUG_RETURN(-1);				/* purecov: inspected */
   if (table->timestamp_field)
   {