Bug #29103 ndb_restore segfaults on NULL var[char|binary]

mysql-test/r/ndb_restore.result:
  Bug #29103 ndb_restore segfaults on NULL var[char|binary]
  - add extra row with NULL value to test
mysql-test/t/ndb_restore.test:
  Bug #29103 ndb_restore segfaults on NULL var[char|binary]
  - add extra row with NULL value to test
storage/ndb/tools/restore/consumer_restore.cpp:
  Bug #29103 ndb_restore segfaults on NULL var[char|binary]
  - check that the attribute is not null

mysql-test/r/ndb_restore.result

@@ -18,7 +18,7 @@ CREATE TABLE `t2_c` (
 PRIMARY KEY  (`capgotod`),
 KEY `i quadaddsvr` (`gotod`)
 ) ENGINE=ndbcluster DEFAULT CHARSET=latin1;
-INSERT INTO `t2_c` VALUES (500,4,'','q3.net','addavp:MK_CASELECTOR=1','postorod rattoaa'),(2,1,'4','','addavp:MK_BRANDTAD=345','REDS Brandtad'),(3,2,'4','q3.net','execorder','fixedRatediPO REDS'),(1,1,'3','','addavp:MK_BRANDTAD=123','TEST Brandtad'),(6,5,'','told.q3.net','addavp:MK_BRANDTAD=123','Brandtad Toldzone'),(4,3,'3','q3.net','addavp:MK_POOLHINT=2','ratedi PO TEST');
+INSERT INTO `t2_c` VALUES (500,4,'','q3.net','addavp:MK_CASELECTOR=1','postorod rattoaa'),(2,1,'4','','addavp:MK_BRANDTAD=345','REDS Brandtad'),(3,2,'4','q3.net','execorder','fixedRatediPO REDS'),(1,1,'3','','addavp:MK_BRANDTAD=123','TEST Brandtad'),(6,5,'','told.q3.net','addavp:MK_BRANDTAD=123','Brandtad Toldzone'),(4,3,'3','q3.net','addavp:MK_POOLHINT=2','ratedi PO TEST'),(5,0,'',NULL,NULL,'');
 CREATE TABLE `t3_c` (
 `CapGoaledatta` smallint(5) unsigned NOT NULL default '0',
 `capgotod` smallint(5) unsigned NOT NULL default '0',
@@ -154,15 +154,15 @@ count(*)
 5
 select count(*) from t2;
 count(*)
-6
+7
 select count(*) from t2_c;
 count(*)
-6
+7
 select count(*)
 from (select * from t2 union 
 select * from t2_c) a;
 count(*)
-6
+7
 select count(*) from t3;
 count(*)
 4
@@ -286,15 +286,15 @@ count(*)
 5
 select count(*) from t2;
 count(*)
-6
+7
 select count(*) from t2_c;
 count(*)
-6
+7
 select count(*)
 from (select * from t2 union 
 select * from t2_c) a;
 count(*)
-6
+7
 select count(*) from t3;
 count(*)
 4
@@ -386,15 +386,15 @@ count(*)
 5
 select count(*) from t2;
 count(*)
-6
+7
 select count(*) from t2_c;
 count(*)
-6
+7
 select count(*)
 from (select * from t2 union 
 select * from t2_c) a;
 count(*)
-6
+7
 select count(*) from t3;
 count(*)
 4

mysql-test/t/ndb_restore.test

@@ -33,7 +33,7 @@ CREATE TABLE `t2_c` (
   PRIMARY KEY  (`capgotod`),
   KEY `i quadaddsvr` (`gotod`)
 ) ENGINE=ndbcluster DEFAULT CHARSET=latin1;
-INSERT INTO `t2_c` VALUES (500,4,'','q3.net','addavp:MK_CASELECTOR=1','postorod rattoaa'),(2,1,'4','','addavp:MK_BRANDTAD=345','REDS Brandtad'),(3,2,'4','q3.net','execorder','fixedRatediPO REDS'),(1,1,'3','','addavp:MK_BRANDTAD=123','TEST Brandtad'),(6,5,'','told.q3.net','addavp:MK_BRANDTAD=123','Brandtad Toldzone'),(4,3,'3','q3.net','addavp:MK_POOLHINT=2','ratedi PO TEST');
+INSERT INTO `t2_c` VALUES (500,4,'','q3.net','addavp:MK_CASELECTOR=1','postorod rattoaa'),(2,1,'4','','addavp:MK_BRANDTAD=345','REDS Brandtad'),(3,2,'4','q3.net','execorder','fixedRatediPO REDS'),(1,1,'3','','addavp:MK_BRANDTAD=123','TEST Brandtad'),(6,5,'','told.q3.net','addavp:MK_BRANDTAD=123','Brandtad Toldzone'),(4,3,'3','q3.net','addavp:MK_POOLHINT=2','ratedi PO TEST'),(5,0,'',NULL,NULL,'');
 
 # Added ROW_FORMAT=FIXED to use below to see that setting is preserved
 # by restore

storage/ndb/tools/restore/consumer_restore.cpp

@@ -1158,19 +1158,22 @@ void BackupRestore::tuple_a(restore_callback_t *cb)
 	char * dataPtr = attr_data->string_value;
 	Uint32 length = 0;
        
-        const unsigned char * src = (const unsigned char *)dataPtr;
-        switch(attr_desc->m_column->getType()){
-        case NdbDictionary::Column::Varchar:
-        case NdbDictionary::Column::Varbinary:
-          length = src[0] + 1;
-          break;
-        case NdbDictionary::Column::Longvarchar:
-        case NdbDictionary::Column::Longvarbinary:
-          length = src[0] + (src[1] << 8) + 2;
-          break;
-        default:
-          length = attr_data->size;
-          break;
+        if (!attr_data->null)
+        {
+          const unsigned char * src = (const unsigned char *)dataPtr;
+          switch(attr_desc->m_column->getType()){
+          case NdbDictionary::Column::Varchar:
+          case NdbDictionary::Column::Varbinary:
+            length = src[0] + 1;
+            break;
+          case NdbDictionary::Column::Longvarchar:
+          case NdbDictionary::Column::Longvarbinary:
+            length = src[0] + (src[1] << 8) + 2;
+            break;
+          default:
+            length = attr_data->size;
+            break;
+          }
         }
 	if (j == 0 && tup.getTable()->have_auto_inc(i))
 	  tup.getTable()->update_max_auto_val(dataPtr,size*arraySize);