Enabled HA_NULL_IN_KEY support

mysql-test/r/ndb_index_unique.result

@@ -109,6 +109,68 @@ a	b	c
 3	4	6
 drop table t3;
 CREATE TABLE t1 (
+pk int NOT NULL PRIMARY KEY,
+a int unsigned,
+UNIQUE KEY (a)
+) engine=ndbcluster;
+insert into t1 values (-1,NULL), (0,0), (1,NULL),(2,2),(3,NULL),(4,4);
+select * from t1 order by pk;
+pk	a
+-1	NULL
+0	0
+1	NULL
+2	2
+3	NULL
+4	4
+insert into t1 values (5,0);
+ERROR 23000: Can't write, because of unique constraint, to table 't1'
+select * from t1 order by pk;
+pk	a
+-1	NULL
+0	0
+1	NULL
+2	2
+3	NULL
+4	4
+delete from t1 where a = 0;
+insert into t1 values (5,0);
+select * from t1 order by pk;
+pk	a
+-1	NULL
+1	NULL
+2	2
+3	NULL
+4	4
+5	0
+CREATE TABLE t2 (
+pk int NOT NULL PRIMARY KEY,
+a int unsigned,
+b tinyint NOT NULL,
+c VARCHAR(10),
+UNIQUE KEY si(a, c)
+) engine=ndbcluster;
+insert into t2 values (-1,1,17,NULL),(0,NULL,18,NULL),(1,3,19,'abc');
+select * from t2 order by pk;
+pk	a	b	c
+-1	1	17	NULL
+0	NULL	18	NULL
+1	3	19	abc
+insert into t2 values(2,3,19,'abc');
+ERROR 23000: Can't write, because of unique constraint, to table 't2'
+select * from t2 order by pk;
+pk	a	b	c
+-1	1	17	NULL
+0	NULL	18	NULL
+1	3	19	abc
+delete from t2 where c IS NOT NULL;
+insert into t2 values(2,3,19,'abc');
+select * from t2 order by pk;
+pk	a	b	c
+-1	1	17	NULL
+0	NULL	18	NULL
+2	3	19	abc
+drop table t1, t2;
+CREATE TABLE t1 (
 cid smallint(5) unsigned NOT NULL default '0',
 cv varchar(250) NOT NULL default '',
 PRIMARY KEY  (cid),