BUG#4818 DELETE FROM tab LIMIT

Check if there are any operations pending that needs to be taken over to the updating/deleting transaction before closing the scan 


sql/ha_ndbcluster.cc:
  Check ops_pending if there are operations to take over before closing the scan

mysql-test/r/ndb_limit.result

+DROP TABLE IF EXISTS t2;
+CREATE TABLE t2 (
+a bigint unsigned NOT NULL PRIMARY KEY,
+b int unsigned not null,
+c int unsigned
+) engine=ndbcluster;
+select count(*) from t2;
+count(*)
+10000
+delete from t2 limit 1;
+select count(*) from t2;
+count(*)
+9999
+delete from t2 limit 100;
+select count(*) from t2;
+count(*)
+9899
+delete from t2 limit 1000;
+select count(*) from t2;
+count(*)
+8899
+update t2 set c=12345678 limit 100;
+select count(*) from t2 where c=12345678;
+count(*)
+100
+select count(*) from t2 where c=12345678 limit 1000;
+count(*)
+100
+select * from t2 limit 0;
+a	b	c
+drop table t2;

mysql-test/t/ndb_limit.test

+-- source include/have_ndb.inc
+
+--disable_warnings
+DROP TABLE IF EXISTS t2;
+--enable_warnings
+
+
+CREATE TABLE t2 (
+  a bigint unsigned NOT NULL PRIMARY KEY,
+  b int unsigned not null,
+  c int unsigned
+) engine=ndbcluster;
+
+
+#
+# insert records into table
+#
+let $1=1000;
+disable_query_log;
+while ($1)
+{
+ eval insert into t2 values($1*10, $1+9, 5*$1), ($1*10+1, $1+10, 7),($1*10+2, $1+10, 7*$1), ($1*10+3, $1+10, 10+$1), ($1*10+4, $1+10, 70*$1), ($1*10+5, $1+10, 7), ($1*10+6, $1+10, 9), ($1*10+7, $1+299, 899), ($1*10+8, $1+10, 12), ($1*10+9, $1+10, 14*$1);
+ dec $1;
+}
+enable_query_log;
+
+select count(*) from t2;
+
+delete from t2 limit 1;
+select count(*) from t2;
+
+delete from t2 limit 100;
+select count(*) from t2;
+
+delete from t2 limit 1000;
+select count(*) from t2;
+
+update t2 set c=12345678 limit 100;
+select count(*) from t2 where c=12345678;
+select count(*) from t2 where c=12345678 limit 1000;
+
+select * from t2 limit 0;
+
+drop table t2;

sql/ha_ndbcluster.cc

@@ -1937,11 +1937,25 @@ int ha_ndbcluster::rnd_init(bool scan)
 int ha_ndbcluster::close_scan()
 {
   NdbResultSet *cursor= m_active_cursor;
+  NdbConnection *trans= m_active_trans;
   DBUG_ENTER("close_scan");
 
   if (!cursor)
     DBUG_RETURN(1);
 
+  
+  if (ops_pending)
+  {
+    /*
+      Take over any pending transactions to the 
+      deleteing/updating transaction before closing the scan    
+    */
+    DBUG_PRINT("info", ("ops_pending: %d", ops_pending));    
+    if (trans->execute(NoCommit) != 0)
+      DBUG_RETURN(ndb_err(trans));
+    ops_pending= 0;
+  }
+  
   cursor->close();
   m_active_cursor= NULL;
   DBUG_RETURN(0);