Bug #27710 Creating unique index fails during single user mode

- enable indexes to be used always, if in single user, reject will happen before, and if it is kerlel doing stuff, it should always be allowed

mysql-test/r/ndb_single_user.result

@@ -55,11 +55,12 @@ update t1 set b=b+100;
 update t1 set b=b+100 where a > 7;
 delete from t1;
 insert into t1 select * from t2;
+create unique index new_index on t1 (b,c);
 drop table t1;
 ERROR 42S02: Unknown table 't1'
-create index new_index on t1 (c);
+create index new_index_fail on t1 (c);
 ERROR HY000: Got error 299 'Operation not allowed or aborted due to single user mode' from NDBCLUSTER
-insert into t1 values (1,1,0),(2,2,0),(3,3,0),(4,4,0),(5,5,0),(6,6,0),(7,7,0),(8,8,0),(9,9,0),(10,10,0);
+insert into t1 values (21,21,0),(22,22,0),(23,23,0),(24,24,0),(25,25,0),(26,26,0),(27,27,0),(28,28,0),(29,29,0),(210,210,0);
 ERROR HY000: Got error 299 'Operation not allowed or aborted due to single user mode' from NDBCLUSTER
 select * from t1 where a = 1;
 ERROR HY000: Got error 299 'Operation not allowed or aborted due to single user mode' from NDBCLUSTER

mysql-test/t/ndb_single_user.test

@@ -76,15 +76,18 @@ update t1 set b=b+100 where a > 7;
 # delete with full table scan
 delete from t1;
 insert into t1 select * from t2;
+# Bug #27710 Creating unique index fails during single user mode
+# - prior to bugfix this would fail
+create unique index new_index on t1 (b,c);
 
 # test some sql on other mysqld
 --connection server2
 --error 1051
 drop table t1;
 --error 1296
-create index new_index on t1 (c);
+create index new_index_fail on t1 (c);
 --error 1296
-insert into t1 values (1,1,0),(2,2,0),(3,3,0),(4,4,0),(5,5,0),(6,6,0),(7,7,0),(8,8,0),(9,9,0),(10,10,0);
+insert into t1 values (21,21,0),(22,22,0),(23,23,0),(24,24,0),(25,25,0),(26,26,0),(27,27,0),(28,28,0),(29,29,0),(210,210,0);
 --error 1296
 select * from t1 where a = 1;
 --error 1296

storage/ndb/src/kernel/blocks/dbdict/Dbdict.cpp

@@ -8158,6 +8158,7 @@ Dbdict::createIndex_toCreateTable(Signal* signal, OpCreateIndexPtr opPtr)
   w.add(DictTabInfo::NoOfKeyAttr, indexPtr.p->noOfPrimkey);
   w.add(DictTabInfo::NoOfNullable, indexPtr.p->noOfNullAttr);
   w.add(DictTabInfo::KeyLength, indexPtr.p->tupKeyLength);
+  w.add(DictTabInfo::SingleUserMode, (Uint32)1);
   // write index key attributes
   for (k = 0; k < opPtr.p->m_attrList.sz; k++) {
     // insert the attributes in the order decided above in attrid_map